environment variables passed to makefile should take care about space on windows

I used configure_make to build openssl on windows use msvc, for rules_foreign_cc pass cc's path with space, this caused
```
NMAKE : fatal error U1077: The system cannot find the path specified
```
can guys fix this problem?

Start with the configure_make rules and the Makefile environment-variable handling, reproducing the MSVC Windows build with a compiler path containing spaces. Done means the build no longer produces NMAKE U1077 for that path and still works for paths without spaces.

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