libodfgen: pass optimization flags to configure

Change-Id: I23aa89602206bedf3b1faf58c5e153a4d06cb515
Reviewed-on: https://gerrit.libreoffice.org/43997Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>

external/libodfgen/ExternalProject_libodfgen.mk

@@ -35,7 +35,8 @@ $(call gb_ExternalProject_get_state_target,libodfgen,build) :
 			--without-docs \
 			--with-sharedptr=c++11 \
 			$(if $(verbose),--disable-silent-rules,--enable-silent-rules) \
-			CXXFLAGS="$(CXXFLAGS) $(CXXFLAGS_CXX11) $(if $(SYSTEM_REVENGE),,$(if $(filter-out MSC,$(COM)),-DLIBREVENGE_VISIBILITY))" \
+			CXXFLAGS="$(gb_CXXFLAGS) $(if $(ENABLE_OPTIMIZED),$(gb_COMPILEROPTFLAGS),$(gb_COMPILERNOOPTFLAGS))" \
+			CPPFLAGS="$(CPPFLAGS) $(if $(SYSTEM_REVENGE),,$(if $(filter-out MSC,$(COM)),-DLIBREVENGE_VISIBILITY))" \
 			$(if $(filter LINUX,$(OS)),$(if $(SYSTEM_REVENGE),, \
 				'LDFLAGS=-Wl$(COMMA)-z$(COMMA)origin \
 					-Wl$(COMMA)-rpath$(COMMA)\$$$$ORIGIN')) \