MinGW port now with core.autocrlf

Here's another cut of the MinGW port, based on master (c260d790c8), which is now obviously en route to 1.5.1.

pull/clone: git://repo.or.cz/git/mingw.git gitweb: http://repo.or.cz/w/git/mingw.git

News:
- core.autocrlf (automatic CRLF<->LF conversion upon checkout and
commit); this flag must still be turned on manually per repository.

- Fixed that incomplete data was sent to the automatically invoked pager
(fflush(stdout) was missing; embarrassing).

- Perl scripts, like git-remote, now work.

-- Hannes