Build failure on MSYS2 due to `asm` block

I'm getting a build failure in MSYS:

$ gmake
cd src && gmake CC="gcc" CFLAGS=" -std=c99 -DWIN32 -DWIN64 -DPERL_TEXTMODE_SCRIPTS -DMULTIPLICITY -DPERL_IMPLICIT_SYS -DUSE_PERLIO -D__USE_MINGW_ANSI_STDIO -fwrapv -fno-strict-aliasing -mms-bitfields   -Os  -msse4.1 -maes"
gmake[1]: Entering directory 'C:/Users/cpigott/dev/perl-CryptX/src'
gcc -Iltm -Iltc/headers -DLTC_SOURCE -DLTC_NO_TEST -DLTC_NO_PROTOTYPES -DLTM_DESC -std=c99 -DWIN32 -DWIN64 -DPERL_TEXTMODE_SCRIPTS -DMULTIPLICITY -DPERL_IMPLICIT_SYS -DUSE_PERLIO -D__USE_MINGW_ANSI_STDIO -fwrapv -fno-strict-aliasing -mms-bitfields   -Os  -msse4.1 -maes -DARGTYPE=4 -c ltc/ciphers/aes/aes_desc.c -o ltc/ciphers/aes/aes_desc.o
ltc/ciphers/aes/aes_desc.c: In function 's_aesni_is_supported':
ltc/ciphers/aes/aes_desc.c:65:7: error: 'asm' undeclared (first use in this function)
   65 |       asm volatile ("cpuid"
      |       ^~~
ltc/ciphers/aes/aes_desc.c:65:7: note: each undeclared identifier is reported only once for each function it appears in
ltc/ciphers/aes/aes_desc.c:65:10: error: expected ';' before 'volatile'
   65 |       asm volatile ("cpuid"
      |          ^~~~~~~~~
      |          ;
gmake[1]: *** [makefile:199: ltc/ciphers/aes/aes_desc.o] Error 1
gmake[1]: Leaving directory 'C:/Users/cpigott/dev/perl-CryptX/src'
gmake: *** [makefile:1642: src/liballinone.a] Error 2

I'm not quite sure how it hasn't been an issue before, maybe something to do with gcc 14?

$ perl --version
This is perl 5, version 39, subversion 10 (v5.39.10) built for MSWin32-x64-multi-thread
...
$ gcc --version
gcc.exe (Rev3, Built by MSYS2 project) 14.1.0
...

As suggested by https://stackoverflow.com/questions/35131350/error-asm-undeclared-first-use-in-this-function, swapping out -std=c99 with -std=gnu99 in the generated makefile means I can get the build to complete. I'm not sure how to do that in Makefile.PL. But you might want to fix the asm blocks to be more standard anyway.

DCIT / perl-CryptX

Build failure on MSYS2 due to `asm` block #102