Fixes to enable building with latest autoconf and automake

RP 2/2/10

Index: offscreen/js/ctypes/libffi/configure.ac
===================================================================
--- offscreen.orig/js/ctypes/libffi/configure.ac	2010-02-02 19:53:16.753906134 +0000
+++ offscreen/js/ctypes/libffi/configure.ac	2010-02-02 19:53:21.895155509 +0000
@@ -17,10 +17,10 @@
 # the wrong, non-multilib-adjusted value will be used in multilibs.
 # As a side effect, we have to subst CFLAGS ourselves.
 
-m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
+m4_rename_force([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
 m4_define([_AC_ARG_VAR_PRECIOUS],[])
 AC_PROG_CC
-m4_rename([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
+m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
 
 AC_SUBST(CFLAGS)
 
Index: offscreen/modules/libpr0n/build/Makefile.in
===================================================================
--- offscreen.orig/modules/libpr0n/build/Makefile.in	2010-02-02 19:53:16.783906873 +0000
+++ offscreen/modules/libpr0n/build/Makefile.in	2010-02-02 19:53:21.895155509 +0000
@@ -92,6 +92,7 @@
 
 export::
 	@{ \
+	\
 	$(foreach d,$(filter-out icon,$(MOZ_IMG_DECODERS)), \
 		echo "#define IMG_BUILD_DECODER_${d}";) \
 	$(foreach d,$(MOZ_IMG_ENCODERS), \
Index: offscreen/configure.in
===================================================================
--- offscreen.orig/configure.in	2010-02-02 19:53:28.493904163 +0000
+++ offscreen/configure.in	2010-02-02 16:33:09.000000000 +0000
@@ -3250,11 +3250,7 @@
     dnl ========================================================
     AC_CHECK_LIB(Xext, XShmCreateImage, _HAVE_XSHM_XEXT=1,,
         $XLIBS $XEXT_LIBS)
-    AC_CHECK_HEADER(X11/extensions/XShm.h)
-    if test "$ac_cv_header_X11_extensions_XShm_h" = "yes" &&
-        test -n "$_HAVE_XSHM_XEXT"; then
-        AC_DEFINE(HAVE_XSHM)
-    fi
+    AC_DEFINE(HAVE_XSHM)
 
     dnl ========================================================
     dnl = Check for XIE
@@ -8120,15 +8116,7 @@
 fi # COMPILE_ENVIRONMENT
 
 if test "$USE_FC_FREETYPE"; then
-    if test "$COMPILE_ENVIRONMENT"; then
-    	_SAVE_CPPFLAGS="$CPPFLAGS"
-    	CPPFLAGS="$CPPFLAGS $FT2_CFLAGS"
-        AC_CHECK_HEADERS(fontconfig/fcfreetype.h, , 
-            [AC_MSG_ERROR(Can't find header fontconfig/fcfreetype.h.)])
-    	CPPFLAGS="$_SAVE_CPPFLAGS"
-    else
         AC_DEFINE(HAVE_FONTCONFIG_FCFREETYPE_H)
-    fi
 fi
 
 dnl Set various defines and substitutions