Log message:
rust/cargo: replace "--frozen --locked" with "--offline" in \ 
various places

The intent of "--frozen --locked" was to not use the network, but the new
"--offline" option is better suited for this purpose.
It for example allows us to patch Cargo.toml if necessary without having
to regen checksums.

Log message:
cbindgen: update to 0.14.3

     * Introduce cbindgen:ignore comment annotation, to allow ignoring items or \ 
modules. (#519)
     * Support for casts in constant expressions. (#526)
     * Make a non-fatal error a warning message. (#535)
     * Add a --metadata option to the CLI, to allow passing pre-computed cargo \ 
metadata. (#538)

Log message:
Rename rust-bin's PKGNAME to rust-bin. Add rust.mk for rust packages.

This allows rust-bin and rust to coexist in bulk builds (for testing, etc),
but the packages still may not be installed at the same time.

rust.mk as a solution for picking the correct rust variant was suggested
by gdt@. It is intended to be included directly by packages that do not
use cargo.mk, and indirectly by packages that do use cargo.mk.

rust.mk provides one user-settable variable:

RUST_TYPE
	as before, whether to bootstrap rust from source or use
	official binaries. may be "src" or "bin"

And two package-settable variables:

RUST_REQ
	the minimum version of Rust required by the package.
	defaults to "1.20.0"

RUST_RUNTIME
	whether Rust is a runtime dependency, may be "yes" or "no"

Log message:
cbindgen: Update to 0.14.2

Changelog:
0.14.2
 * Fixed minimal dependency versions. (#507)
 * Add an option to write pragma once. (#511)
 * Fix submodule scanning for implicit Rust 2018 modules. (#512)
 * Fix dependency parsing / scanning to handle target-specific versions. (#513)
 * Use heck for case conversion. (#514)
 * Add support for verbatim content after includes. (#416)
 * Allow to add attributes to most generated functions. (#515)

0.14.1
 * Handle mangling pointers. (#508)
 * Unconditionally generate a return statement in partialeq implementations. (#509)

0.14.0
 * Minor tweak at how [export.exclude] is handled to allow excluding
   generic instantiations in C mode. (#501)
 * Documented cpp_compat option. (#496)
 * Fixed a panic when parsing associated constants for a built-in type. (#494)

0.13.2
   * Constants now have suitable documentation. (#471)
   * Fixed some C warnings by emitting void when there are no arguments. (#470)
   * Avoids reading cargo.toml when not needed, which can cause panics in \ 
workspace situations.
   * Only write `default` cases if the switch is not exhaustive. (#475)
   * Some warnings have been refined. (#477)
   * Code generation for static arrays has been fixed. (#479)
   * Opt-in support for constexpr in constants. (#481)
   * Fix C code generation and some warnings when extremely large constants are \ 
used. (#490)
   * Proper escaping of enum variants and fields. (#483)
   * Added support for RefCell (as an opaque type) and Cell. (#489)

5a4d74b
ir: escape export_name while writing source of EnumVariant

Log message:
cbindgen: Update to 0.13.1

Changelog:
0.13.1
  * Support #[cfg] on individual enum variants. (#469)

0.13.0
 * Support 'swift_name' attributes on generated functions (#449)
 * Add [export.pre_body] to config (#452)
 * Handle new line in doc attribute (#454)
 * Add support for `Self` in tagged enums, structs and unions (#455, #455, #456)
 * Make sentinel variant respect regular config (#459)
 * Fix layout of tagged enums with size under some configurations (#463)
 * Add an option to allow configuring the order of function names in generated \ 
headers (#466)

0.12.2
Not available

Log message:
Rename EFFECTIVE_MAKE_JOBS -> _MAKE_JOBS_N, suggested by gdt.

I am under the impression we use _THING to mean "defined by the
implementation", which would be similar to the C meaning of __ prefix,
rather than "private to this file".

Log message:
Make cargo packages respect MAKE_JOBS

Log message:
cbindgen: Update to 0.12.1

Changelog:
0.12.1
 * Added support for #[repr*64)] on enums. \ 
https://github.com/eqrion/cbindgen/pull/441
 * Added support to generate plain enums instead of enum classes for C++. \ 
https://github.com/eqrion/cbindgen/pull/443
 * Fixed dependency resolution with lockfile v2. \ 
https://github.com/eqrion/cbindgen/pull/438

0.12.0
 * Added support for #[repr(align)] and #[repr(packed)] on structs and unions. \ 
https://github.com/eqrion/cbindgen/pull/431
 * Added support to generate copy-assignment operators for enums. \ 
https://github.com/eqrion/cbindgen/pull/434

0.11.1
Not available

0.11.0
 * Made rust char map to uint32_t. https://github.com/eqrion/cbindgen/pull/424

Log message:
lang/rust/cargo.mk: Remove default DIST_SUBDIR

Some packages using cargo.mk have distfiles not from
crates.io.

Log message:
devel/cbindgen: Update to 0.10.1

Changes:
     * Initialize struct literal with list-initializer for C++11 standard.
     * Surround namespace with __cplusplus ifdef in cpp_compat mode.
     * Add support for --quiet flag.
     * Map char to char32_t.
     * Improve binding_crate_ref() error message.
     * avoid prematurely returning during expansion.
     * Add support for adding "using namespace" statements.
     * Improved error message for missing config file.
     * Add missing header for char32_t.