Introduce $(ECHOPATH) to print DOSish path string on MSYS bash for alternative of $(ECHO).
Introduce $(ECHOPATH) to print DOSish path string on MSYS bash for alternative of $(ECHO).

On mingw and python/w32, lit would not be expected to understand MSYS-style path.

git-svn-id: a4a6f32337ebd29ad4763b423022f00f68d1c7b7@127073 91177308-0d34-0410-b5e6-96231b3b80d8

lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx