[Mtools] Support cross-compiling for Windows with MinGW; some Windows fixes

[Jamey Sharp]

[Please CC us on replies.]

With the attached patches, mtools supports cross-compilation for Windows
using MinGW.  We have also changed mtools to use '\' as the path
separator on Windows, and to pass drive letters other than the
command-line drive :: through to Windows.

In order to build mtools, we run configure like this:

ac_cv_func_setpgrp_void=yes ./configure --build=i386-linux-gnu 
--host=i586-mingw32msvc --disable-floppyd --without-x --disable-raw-term

We specify both --build and --host to force configure into
cross-compilation mode; otherwise, it tries to run a test program for
the host on the build system, and if the build system has binfmt-misc
set up to run exe files with wine as many distros do by default,
configure will assume native compilation and fail.

Would you consider merging these patches into the next version of
mtools?

- Jamey Sharp and Josh Triplett

0001-Add-support-for-cross-compiling-mtools-for-Windows-using-MinGW.txt
Description: Text document

0002-Use-as-the-path-separator-in-_basename-on-Windows-and-strip-.exe-from-argv-0-before-checking-for-program-name.t
Description: Text document

0003-On-Windows-support-only-the-command-line-image-drive-all-others-access-the-corresponding-real-drive.txt
Description: Text document

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