New comment by tavianator on void-packages repository

https://github.com/void-linux/void-packages/pull/35836#issuecomment-1050947339

Comment:
The musl failure is a bug in musl I think.  POSIX says this about `fnmatch()`:

> If pattern ends with an unescaped <backslash>, fnmatch() shall return a non-zero value (indicating either no match or an error).

And yet:

```
$ cat foo.c
#include <assert.h>
#include <fnmatch.h>

int main(void) {
        assert(fnmatch("\\", "\\", 0) != 0);
        return 0;
}
$ gcc foo.c -o foo && ./foo
$ musl-gcc foo.c -o foo && ./foo
Assertion failed: fnmatch("\\", "\\", 0) != 0 (foo.c: main: 5)
```