Makefile: Add profile target

Makefile

@@ -42,7 +42,12 @@ GTEST_OBJECTS=$(filter-out qswiki.o, $(WIKIOBJECTS))
 .DEFAULT_GOAL := qswiki
 
 release: CXXFLAGS=$(RELEASE_CXXFLAGS)
+profile: CXXFLAGS=$(RELEASE_CXXFLAGS) -pg
+profile: LDFLAGS+= -pg
+
 release: qswiki
+profile: qswiki
+
 qswiki: $(WIKIOBJECTS)
 	$(CXX) $(WIKIOBJECTS) ${LDFLAGS} ${INCLUDEFLAGS}  -o qswiki