cross compiling with txlib support

[Glenn McGrath]

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Attached is a patch i need to use to cross compile xserver with tslib
support.

Without it i get...

checking tslib.h usability... yes
checking tslib.h presence... no
configure: WARNING: tslib.h: accepted by the compiler, rejected by the
preprocessor!
configure: WARNING: tslib.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to bug-autoconf@gnu.org. ##
configure: WARNING:     ## ------------------------------------ ##
checking for tslib.h... no


The problem is generally discussed in the following email.
http://mail.gnu.org/archive/html/autoconf/2003-03/msg00156.html


I dont know if this is the best way to fix the problem, but it works for
me.



Glenn

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