copy wxAutohacks into main tree

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@47038 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

build/autoconf_prepend-include/Makefile

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+# Created: 2005/03/12
+# Author: David Elliott
+
+# For autoconf: Debian in their infinite wisdom decided to improve upon
+# the standard autoconf 2.59 macros. Thus Debian's autoconf generates
+# a totally different configure script.  This fixes it to look
+# mostly like Debian's.  There are also some fixes pulled in from the OS/2
+# fork of autoconf.
+
+# Rule to freeze the m4 so autoconf will actually use it.
+# NOTE: VERY important to cd to somewhere there are no .m4 files.
+# or at least no aclocal.m4 or else autom4te helpfully picks it up.
+.PHONY: all
+all: autoconf/autoconf.m4f
+
+AUTOCONF_SOURCES = \
+  autoconf/c.m4 \
+  autoconf/general.m4 \
+  autoconf/libs.m4 \
+  autoconf/status.m4
+
+AUTOM4TE=autom4te
+
+autoconf/autoconf.m4f: $(AUTOCONF_SOURCES)
+	$(AUTOM4TE) -B . --language=Autoconf --freeze --output=autoconf/autoconf.m4f
+