fix(buildroot): cannot build libffi

[BlackHole1]

Description of Change

When using the new version of GCC, it is unable to compile libffi.

Error Log:

../src/tramp.c: In function 'ffi_tramp_get_temp_file':
../src/tramp.c:262:22: error: implicit declaration of function 'open_temp_exec_file' [-Werror=implicit-function-declaration]
  262 |   tramp_globals.fd = open_temp_exec_file ();
      |                      ^~~~~~~~~~~~~~~~~~~
make[5]: *** [Makefile:1323：src/tramp.lo] Error 1
make[4]: *** [Makefile:1395：all-recursive] Error 1

Ref: libffi/libffi#764

Thanks, @serge-sans-paille for your patch :)

Required to run CI

• applehv-rootfs-amd64
• applehv-rootfs-arm64
• initrd-amd64
• initrd-arm64
• kernel-amd64
• kernel-arm64