Log message:
Update devel/c++gsl to version 4.0.0

Pkgsrc changes:
Use devel/cmake/build.mk
CMake only looks for the c++ compiler so remove c
from USE_LANGAGES.
Due to a breaking change, that gsl/multi_span is not
installed anymore and gsl::narrow is in gsl/narrow not
gsl/util, update BUILDLINK_API_DEPENDS.
Change maintainer, ok'ed by minskim.

Changes from Release Notes:

* Deprecation of gsl::string_span
* Removal of <gsl/multi_span>
* Header files dropped the gsl_ prefix
* Changes to not_null
* gsl::span and std::span now use the correct specialization of gsl::at
* The zstring family no longer requires empty brackets to be used
  - for example, void foo(zstring<> str); should now be
    void foo(zstring str);
* gsl::narrowing_error now has a helpful what() message
* finally and final_action are now [[nodiscard]]
* GSL will work in environments where exceptions are disabled, with
  some caveats
* GSL will work in environments which do not support ios, via the
  addition of the GSL_NO_IOSTREAMS flag
* CMake and build improvements

Log message:
c++gsl: Require a C++14 compiler.

Log message:
Update c++gsl to version 3.1.0

Pkgsrc changes:
Add buildlink3.mk

Changes:
CMake find_package support.
gsl::span and gsl::span_iterator that align with the c++20 standard.
Fix bug in gsl::narrow.

Log message:
archivers: Replace RMD160 checksums with BLAKE2s checksums

All checksums have been double-checked against existing RMD160 and
SHA512 hashes

Could not be committed due to merge conflict:
devel/py-traitlets/distinfo

The following distfiles were unfetchable (note: some may be only fetched
conditionally):

./devel/pvs/distinfo pvs-3.2-solaris.tgz
./devel/eclipse/distinfo eclipse-sourceBuild-srcIncluded-3.0.1.zip

Log message:
devel: Remove SHA1 hashes for distfiles

Log message:
devel/c++gsl: Import version 1.0.0

The Guideline Support Library (GSL) contains functions and types that
are suggested for use by the C++ Core Guidelines maintained by the
Standard C++ Foundation. This package contains Microsoft's
implementation of GSL.