Fold in MinGW Phobos test update.

Merge pull request ldc-developers#379 from klickverbot/initializer-ty…

…pe-mismatch

Fix initializer type mismatch crash

Merged in MinGW port updates.

This has been submitted to upstream DMD as GitHub pull
request ldc-developers#2086, but didn't make it in time for 2.063.

Update LDC version strings.

This should be defined in CMake.