[AD] mingw sed fix

["Elias Pschernig" <eliaspschernig@xxxxxxxxxx>]

I examined why the native mingw tools don't work with make depend and
fixdll.bat, and the result is:

make depend works, only the / path separators are not understood by
DOS, and the __MINGW32__ is already defined.

In fixdll, the sed scripts get confused by extra carriage return
characters before line feed characters.

I made patches to fix both. Now Allegro can be created without ever
having to install djgpp or any djgpp tools.

(The first patch only removes the defines and replaces '/' by '\' in
makefile.mgw, the second patch only replaces a '\n' by '.\n' in
fixdll.bat)

Elias Pschernig

Attachment: mingmake.diff
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Attachment: fixdll.diff
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