`make check` yields some failures on macOS

[Chris Palmer]

Hello,

Thanks for making GMP! :)

I am building gmp 6.3.0 (downloaded from the .tar.xz on the web site just
now) on macOS (Sonoma, 14.6.1). I've attached tests/mpn/test-suite.log;
please let me know if you need anything more. I build with just
`./configure` (no options) and `make`.

```
woop:~/code/impr/gmp-6.3.0 % uname -a
Darwin woop.local 23.6.0 Darwin Kernel Version 23.6.0: Mon Jul 29 21:13:00
PDT 2024; root:xnu-10063.141.2~1/RELEASE_X86_64 x86_64
woop:~/code/impr/gmp-6.3.0 % clang --version
Apple clang version 15.0.0 (clang-1500.3.9.4)
Target: x86_64-apple-darwin23.6.0
Thread model: posix
InstalledDir:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
woop:~/code/impr/gmp-6.3.0 % echo $CFLAGS

woop:~/code/impr/gmp-6.3.0 %
```
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