gtk: Remove unused variables from build scripts

ALL_FILES and INCLUDE_VARIABLES are unused

gtk/Makefile.am

@@ -101,7 +101,7 @@ endif
 # This places the generated .def file in srcdir, since it is expected to be there.
 # (The one from a tarball is)
 gtk.def: gtk.symbols
-	(echo -e EXPORTS; $(CPP) -P -DINCLUDE_VARIABLES -DG_OS_WIN32 -DALL_FILES - <$(srcdir)/gtk.symbols | $(SED) -e '/^$$/d' -e 's/^/	/' -e 's/G_GNUC_[^ ]*//g') > $(srcdir)/gtk.def
+	(echo -e EXPORTS; $(CPP) -P -DG_OS_WIN32 - <$(srcdir)/gtk.symbols | $(SED) -e '/^$$/d' -e 's/^/	/' -e 's/G_GNUC_[^ ]*//g') > $(srcdir)/gtk.def
 
 TESTS_ENVIRONMENT = srcdir="$(srcdir)" gtk_all_c_sources="$(gtk_all_c_sources)"
 if OS_LINUX

gtk/abicheck.sh

 #! /bin/sh
 
-cpp -DINCLUDE_VARIABLES -P -DG_OS_UNIX -DGTK_WINDOWING_X11 -DALL_FILES ${srcdir:-.}/gtk.symbols | sed -e '/^$/d' -e 's/ G_GNUC.*$//' -e 's/ PRIVATE//' | sort > expected-abi
+cpp -P -DG_OS_UNIX -DGTK_WINDOWING_X11 ${srcdir:-.}/gtk.symbols | sed -e '/^$/d' -e 's/ G_GNUC.*$//' -e 's/ PRIVATE//' | sort > expected-abi
 nm -D -g --defined-only .libs/libgtk-x11-3.0.so | cut -d ' ' -f 3 | egrep -v '^(__bss_start|_edata|_end)' | sort > actual-abi
 diff -u expected-abi actual-abi && rm -f expected-abi actual-abi

gtk/makefile.msc.in

@@ -573,7 +573,7 @@ gtk_extra_sources = \
 
 gtk.def: gtk.symbols makefile.msc
 	echo EXPORTS > gtk.def
-	cl /EP -DINCLUDE_VARIABLES -DG_OS_WIN32 -DALL_FILES \
+	cl /EP -DG_OS_WIN32 \
 		-DG_GNUC_MALLOC= -DG_GNUC_CONST= -DG_GNUC_NULL_TERMINATED= -DG_GNUC_NORETURN= \
 		-DG_GNUC_PRINTF=;G_GNUC_PRINTF gtk.symbols >> gtk.def