This allows setting WINDRES to mingw's windres.
For the record, mingw's windres needs --use-temp-file for a weird reason:
in that case, it keeps preprocessor arguments intact (including quotes),
without it, mingw's windres calls popen, which happens to pass the entire
command to sh -c, stripping quotes after evaluation and causing a syntax
error in mingw's windres.
To use mingw's windres, set WINDRES to:
- `x86_64-w64-mingw32-windres` on 64 bit
- `i686-w64-mingw32-windres` on 32 bit
Signed-off-by: Tibor Vass <tibor@docker.com>
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