[PATCH] 2.31 breaks build of 'gold' for x86_64-w64-mingw32

[Alexey Neyman]

Hi,

Canadian cross for x86_64-w64-mingw32 host (in crosstool-NG) has been 
failing to build gold because the mkdtemp and link functions are not 
available.

Patch attached. Replacement code for mkdtemp stolen from 
binutils/bucomm.c; link() call is just placed under an appropriate 
ifdef, as the function already has a fallback (copying the file).

Regards,
Alexey.

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