[PATCH] Backport g(s)size -> g(u)intptr atomics in builtin glib for gcc14 and clang15

[Dan Fuhry]

Hello -
I've discovered that pkg-config 0.29.2 doesn't build on clang 15 and up and
gcc 14 and up, due to -Wint-conversion now defaulting to being an error in
both compilers. The old version of glib 2.36 bundled with pkg-config uses
gssize/gssize as the return type of the g_atomic_pointer_* functions, which
newer versions of gcc and clang complain (rightly) is not portable (as
these are aliased to long and ulong, respectively).

This was previously addressed in glib upstream commit c762d511 [1] by Alex
Richardson on Dec 14, 2022. The attached patch backports Alex's change to
glib 2.36 bundled with pkg-config, and also switches to the newer
__atomic_* intrinsics from commit 2eb37622 [2] (Philip Withnall).

This patch has been tested on clang 17 and only clang 17.

[1]
https://gitlab.gnome.org/GNOME/glib/-/commit/c762d511346d3cb84cea3557a246ccf8873b4a1c
[2]
https://gitlab.gnome.org/GNOME/glib/-/commit/2eb37622418a5c9f31a9d728a99bc621d3157ab0
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