make_makefiles: Add a target to build only the test directories.

dlls/Makefile.in

@@ -461,7 +461,9 @@ $(TESTSUBDIRS:%=%/__crosstest__): $(CROSS_IMPLIBS)
 
 implib: $(IMPORT_LIBS)
 
-.PHONY: implib
+testsubdirs: $(TESTSUBDIRS)
+
+.PHONY: implib testsubdirs
 
 activeds/libactiveds.def activeds/libactiveds.a: activeds/activeds.spec $(WINEBUILD)
 	@cd activeds && $(MAKE) `basename $@`

tools/make_makefiles

@@ -413,7 +413,8 @@ sub update_dlls(@)
     $text .= "\n\n";
     $text .= "\$(TESTSUBDIRS:%=%/__crosstest__): \$(CROSS_IMPLIBS)\n\n";
     $text .= "implib: \$(IMPORT_LIBS)\n\n";
-    $text .= ".PHONY: implib\n\n";
+    $text .= "testsubdirs: \$(TESTSUBDIRS)\n\n";
+    $text .= ".PHONY: implib testsubdirs\n\n";
 
     foreach my $mod (sort keys %importlibs)
     {