[libgfortran, patch] Fix fd leak in unix.c’s fallback_access(), aka PR 45165

[FX]

The attached patch fixes a file descriptor leak in fallback_access(), a function in io/unix.c for systems without a system access() (which happens on newlib systems); this is PR 45165.

The patch was tested by building and regtesting on x86_64-darwin, simulating the lack of access() by overriding libgfortran configure results. OK to commit to trunk?

Cheers,
FX

PS: I don't think it's worth backporting, as it's only a leak on newlib systems


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