Allow to specify "--cc=msc" as command line.

[Jarod42]

What does this PR do?

Allow to specify "--cc=msc" as command line (in addition to gcc/clang).

How does this PR change Premake's behavior?

Just the command line to specify cc

Anything else we should know?

Tested on https://github.com/Jarod42/premake-sample-projects/tree/windows_ninja
(More specifically that action run).

Did you check all the boxes?

• Focus on a single fix or feature; remove any unrelated formatting or code changes
• Add unit tests showing fix or feature works; all tests pass
• Mention any related issues (put closes #XXXX in comment to auto-close issue when PR is merged)
• Follow our coding conventions
• Minimize the number of commits
• Align documentation to your changes

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[Jarod42]

[ FAILED ] premake_http.http_responsecode
D:/a/premake-core/premake-core/tests/base/test_http.lua:53: expected 502.0 but was 418

Was unrelated to my change, random network issue (502 is Bad Gateway)

BTW test was reversed to have correct error message, i.e:

-		test.isequal(responseCode, 418)
+		test.isequal(418, responseCode)