Honor DESTDIR in w32api and mingw

[Charles Wilson]

[Cross-posted to mingw-dvlpr, but as both lists are by subscription
only, and I'm subscribed under separate aliases, I can't "link" the two
posts].

For a number of reasons [*], when building w32api and mingw-runtime
"natively" under MinGW/MSYS, DESTDIR is known not to work. However,
that's no reason not to support it when building with a cross-compiler
or when building natively under cygwin.

The attached patch allows DESTDIR installations to succeed, at least in
those configurations where it would work otherwise [*]. As usual, if
DESTDIR is empty there should be no impact on existing behavior.

[*] when prefix is DOS-ized to "C:/foo", ${DESTDIR)$(prefix) is usually
not what you want: /tmp/barC:/foo or C:/TEMPC:/foo. This is a known
issue, and is not what I'm trying to address.

2009-10-15  Charles Wilson  <...>

	Honor DESTDIR for winsup/mingw and winsup/w32api.
	* winsup/mingw/Makefile.in: Honor DESTDIR and add to
	FLAGS_TO_PASS.
	* winsup/mingw/mingwex/Makefile.in: Honor DESTDIR.
	* winsup/mingw/profile/Makefile.in: Honor DESTDIR.
	* winsup/w32api/Makefile.in Honor DESTDIR and add to
	FLAGS_TO_PASS.
	* winsup/w32api/lib/Makefile.in: Honor DESTDIR and add to
	FLAGS_TO_PASS.
	* winsup/w32api/lib/ddk/Makefile.in: Honor DESTDIR.
	* w32api/lib/directx/Makefile.in: Honor DESTDIR.

--
Chuck
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