@@ Support for WINEPREFIX so that a separate .wine/ can be used.

@@ When adding support to a new version need to check if any new options
   were added to any of the tools.

@@ Requires bash 4, realpath dirpath

@@ What about 64-bit? cl-64 or some such?

@@ There is link POSIX command. link.exe? cl-14.exe?

@@ Rename to msvc-posix, msvc-cross, msvc-wine, msvc-unix. Or just
   keep it?