Implement building different runtime versions.
Fix previous commit.
Add info to README.
Fix display version by default.
Checkout all mingw-w64 tools in versioned directories
Modify some functions to show log on error and exit instead sending result.
Extend patch function to check patch before apply and accept patches with levels p0…p3.
Modify functions to show log on error.
Add function to show log.
Some optimize.
Merge pull request #281 from Alexpux/mingw-w64-builds

Implement building different runtime versions.