Replace 'w64 mingw-runtime' by 'mingw-w64 runtime'

Also replace 'This file is a part of' by 'This file is part of' for consistency

git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@5147 4407c894-4637-0410-b4f5-ada5f102cad1
1344 files changed