acinclude.m4.patch

The attached patch to acinclude.m4 implements the following changes:

*) Check for xrc and stc headers to avoid compile problems.

I should point out that, because of the very complex nature of the
wxWindows system, that I am only able to test for the existance of the
include files, not whether they successfully preprocess. This shouldn't
really cause too many problems, since a bad header will certainly cause
problems later on, and we don't use the config.h produced by autoconf
anyway.

ahp