New comment by tornaria on void-packages repository

https://github.com/void-linux/void-packages/pull/45708#issuecomment-1688333569

Comment:
I know how to fix musl. This is an issue in giac with musl libc:
```
$ cat test.cc
#include <giac/giac.h>
$ cc -c test.cc
In file included from /usr/include/giac/giac.h:3,
                 from test.cc:1:
/usr/include/giac/first.h: In function 'float fgamma(float)':
/usr/include/giac/first.h:575:39: error: 'gammaf' was not declared in this scope; did you mean 'tgammaf'?
  575 | inline float fgamma(float f1){ return gammaf(f1); } // or tgammaf(f1) on some versions of emscripten
      |                                       ^~~~~~
      |                                       tgammaf
```

It's already ack by upstream and it will be fixed, meanwhile I'll include a workaround so it works for us.