sharedvisitor generator should also be rebuilt if clang changes

Change-Id: I7602974ed6f4969ec9f79504bdb72758a747d39a
Reviewed-on: https://gerrit.libreoffice.org/72982
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

compilerplugins/Makefile-clang.mk

@@ -203,6 +203,8 @@ $(CLANGOUTDIR)/sharedvisitor/generator$(CLANG_EXE_EXT): $(CLANGINDIR)/sharedvisi
 	$(QUIET)$(COMPILER_PLUGINS_CXX) $(CLANGCXXFLAGS) $(CLANGOUTDIR)/sharedvisitor/generator.o \
         -o $@ $(CLANGTOOLLIBS)
 
+$(CLANGOUTDIR)/sharedvisitor/generator$(CLANG_EXE_EXT): $(SRCDIR)/compilerplugins/Makefile-clang.mk $(CLANGOUTDIR)/clang-timestamp
+
 $(CLANGOUTDIR)/sharedvisitor:
 	mkdir -p $(CLANGOUTDIR)/sharedvisitor