Log message:
Make some int cast warnings non-fatal for clang

Log message:
*: recursive bump for libffi

Log message:
json-glib: remove now redundant test target

Now that adam@ has added a generic test target to meson's build.mk,
we can just rely on that, instead.

Log message:
Rename py-meson to meson.

The motivation is to consider meson as an application, so there is only
one copy on the system, and as a python 3 program, it can build python 2
packages.

Log message:
json-glib: update to 1.4.4.

Switch to meson build system.  Based on wip/json-glib.

Overview of changes for 1.4
==============================
• Use Meson as the only build system
• #773504 - Avoid extra allocations [Garrett Regier]
• #780550 - meson error looking for python3 [Daniele Forghieri]
• #769206 - docs: Clarify when NULL might be returned [Matthew Leeds]
• #766281 - utils/json_from_string: Don't reset user-provided error
            argument [Heinrich Fink]
• #758580 - json_reader_is_value returns TRUE for null type but
            json_reader_get_value throws an error [Robert Ancell]
• #768788 - Incorrect account of jsonPath syntax in doc [Allin Cottrell]
• #774688 - json_from_string() could be optimized to avoid copying the
            root node [Ole André Vadla Ravnås]

Log message:
Fix indentation in buildlink3.mk files.

The actual fix as been done by "pkglint -F */*/buildlink3.mk", and was
reviewed manually.

There are some .include lines that still are indented with zero spaces
although the surrounding .if is indented. This is existing practice.

Log message:
Revert buildtool.mk additions for glib-{mkenums,genmarshal} using packages
Add TOOL_DEPENDS+=glib2-tools to glib2/buildlink3.mk

Log message:
json-glib: requires glib-mkenums which is now in py-glib2-tools