MinGW builds fail with command line too long with lots of sources

[Marc Valle]

When doing builds using MinGW with large numbers of files linking would fails with 'The command line is too long'. It does't look like we are using response files.

[Jason Kenny]

Merged in marc_valle/parts/mingw-longcmdline (pull request #29)

Support long link command lines with MinGW

When doing builds using MinGW with large numbers of files linking would fail with 'The command line is too long'. This commit adds support for response files when linking using MinGW.

Fixes issue #28

Approved-by: Jason Kenny [e-mail]

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