mingw-find-* rewrite

[Farkas Levente]

hi,
i rewrite all mingw-find- scripts since the build targets was hardcoded
into these.
the mingw-find-requires already has a bug since the *ddl_found if never
be true since the win32/64_dll_found=true was inside a pipe which cause
it to be local variable of the subshell.
i hope these also can be applied.

both of the macro and this patch are backward compatible with the
current filesystem macro and files scripts. so those who wouldn't like
to use the the mingwtool script still can use the old long spec files.

-- 
  Levente                               "Si vis pacem para bellum!"
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