Update nixpkgs snapshot

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[akirak]

This nixpkgs update brings at least two issues.

One issue is for building Emacs 24.2 or before on Linux. implicit-function-declaration warning raises the following error. I am able to fix this by suppressing the error on the relevant Emacs versions:

emacs> gmalloc.c: In function 'valloc':
emacs> gmalloc.c:1848:16: error: implicit declaration of function '__getpagesize'; did you mean 'getpagesize'? [8;;https://gcc.gnu.org/onlinedocs/gcc-14.2.0/gcc/Warning-Options.html#index-Wimplicit-function-declaration-Wimplicit-function-declaration8;;]
emacs> 1848 | pagesize = __getpagesize ();
emacs> | ^~~~~~~~~~~~~
emacs> | getpagesize
emacs> make[1]: *** [Makefile:322: gmalloc.o] Error 1
emacs> make[1]: *** Waiting for unfinished jobs....
emacs> make[1]: Leaving directory '/build/source/src'
emacs> make: *** [Makefile:382: src] Error 2

Another issue is for Mac. INFINITY in the enum definition is mistakenly expanded as a macro because of clang-wrapper, but I don't know how to fix this:

emacs> make[1]: *** [Makefile:379: process.o] Error 1
emacs> make[1]: *** Waiting for unfinished jobs....
emacs> make[1]: Leaving directory '/private/tmp/nix-build-emacs-25-1.drv-0/source/src'
emacs> make: *** [Makefile:398: src] Error 2
error: builder for '/nix/store/05ziwn4ic181322w2ibk4n35wr110vn7-emacs-25-1.drv' failed with exit code 2;
last 25 log lines:
> 74 | #define UINTMAX_C(v) (v ## UL)
> | ^~~~~~~
> :93:1: note: expanded from here
> 93 | 18446744073709551615UL
> | ^~~~~~~~~~~~~~~~~~~~~~
> CC lread.o
> 1 warning generated.
> CC dynlib.o
> CC emacs-module.o
> CC syntax.o
> CC unexmacosx.o
> CC bytecode.o
> CC process.o
> CC gnutls.o
> process.c:4521:33: error: expected identifier
> 4521 | enum { MINIMUM = -1, TIMEOUT, INFINITY } wait;
> | ^
> /nix/store/p7ck87mq20ngn4rv8w52imx4c80qj801-clang-wrapper-19.1.5/resource-root/include/float.h:173:20: note: expanded from macro 'INFINITY'
> 173 | # define INFINITY (__builtin_inff())
> | ^
> 1 error generated.
> make[1]: *** [Makefile:379: process.o] Error 1
> make[1]: *** Waiting for unfinished jobs....
> make[1]: Leaving directory '/private/tmp/nix-build-emacs-25-1.drv-0/source/src'
> make: *** [Makefile:398: src] Error 2
For full logs, run 'nix log /nix/store/05ziwn4ic181322w2ibk4n35wr110vn7-emacs-25-1.drv'.
error: 1 dependencies of derivation '/nix/store/x0ka4pz7q7pw94fp72jsy4rix9j4xy6q-emacs-with-packages-25-1.drv' failed to build
error: 1 dependencies of derivation '/nix/store/zhyc18w8qdaya2ks8jpbv9fm69f1h62m-test.drv' failed to build
Error: Process completed with exit code 1.

[akirak]

@purcell This update wasn't initially successful. Could you confirm the additional changes in this PR?

• Suppressing implicit-function-declaration error for older Emacs code
• Adding a patch from emacs-mirror/emacs@222b597 for older Emacsens on Mac (clang)

[purcell]

Re-opening to rebase, then will merge.

[purcell]

Thanks @akirak, happy 2025!

[akirak]

@purcell Thank you!