libqxp: pass optimization flags to configure

Change-Id: I16586e206bef696023a124fb69b28c1bd92d0cff
Reviewed-on: https://gerrit.libreoffice.org/44001Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>

external/libqxp/ExternalProject_libqxp.mk

@@ -34,7 +34,8 @@ $(call gb_ExternalProject_get_state_target,libqxp,build) :
 			--disable-werror \
 			--disable-weffc \
 			$(if $(verbose),--disable-silent-rules,--enable-silent-rules) \
-			CXXFLAGS="$(CXXFLAGS) $(CXXFLAGS_CXX11) $(BOOST_CPPFLAGS)" \
+			CXXFLAGS="$(gb_CXXFLAGS) $(if $(ENABLE_OPTIMIZED),$(gb_COMPILEROPTFLAGS),$(gb_COMPILERNOOPTFLAGS))" \
+			CPPFLAGS="$(CPPFLAGS) $(BOOST_CPPFLAGS)" \
 			REVENGE_GENERATORS_CFLAGS=' ' REVENGE_GENERATORS_LIBS=' ' REVENGE_STREAM_CFLAGS=' ' REVENGE_STREAM_LIBS=' ' \
 			ax_cv_cxx_compile_cxx11=yes \
 			$(if $(CROSS_COMPILING),--build=$(BUILD_PLATFORM) --host=$(HOST_PLATFORM)) \