build: Add uninstall-pkgconfig target to match install-lib*-pkgconfig

Makefile

@@ -161,7 +161,7 @@ install-data: $(DATA_FILES)
 	$(Q)mkdir -p "$(DATADIR)"
 	$(INSTALL) -m 644 $(DATA_FILES) "$(DATADIR)"
 
-uninstall: uninstall-libs uninstall-headers uninstall-data
+uninstall: uninstall-data uninstall-headers uninstall-libs uninstall-pkgconfig
 
 uninstall-data:
 	$(RM) -r "$(DATADIR)"

avbuild/library.mak

@@ -92,8 +92,10 @@ uninstall-libs::
 
 uninstall-headers::
 	$(RM) $(addprefix "$(INCINSTDIR)/",$(HEADERS) $(BUILT_HEADERS))
-	$(RM) "$(LIBDIR)/pkgconfig/lib$(NAME).pc"
 	-rmdir "$(INCINSTDIR)"
+
+uninstall-pkgconfig::
+	$(RM) "$(LIBDIR)/pkgconfig/lib$(NAME).pc"
 endef
 
 $(eval $(RULES))