#i125121# speed up the "make writeable" step when building external libraries

avoiding the many individual invocations of chmod for each directory makes
this step about ten times faster on Windows without SSD (460sec -> 41sec
for boost alone). With SSD storage the speedup should be even higher.

solenv/inc/tg_ext.mk

@@ -164,8 +164,7 @@ $(PACKAGE_DIR)/$(UNTAR_FLAG_FILE) : $(PRJ)/$(ROUT)/misc/$(TARFILE_MD5)-$(TARFILE
     @-$(MKDIRHIER) $(PACKAGE_DIR)$(fake_root_dir)
     $(COMMAND_ECHO)cd $(PACKAGE_DIR)$(fake_root_dir) && ( $(shell @$(TYPE) $(PRJ)/$(ROUT)/misc/$(TARFILE_MD5)-$(TARFILE_NAME).unpack)) && $(TOUCH) $(UNTAR_FLAG_FILE)
     @echo make writeable...
-    @cd $(PACKAGE_DIR) && chmod -R +rw $(TARFILE_ROOTDIR) && $(TOUCH) $(UNTAR_FLAG_FILE)
-    @cd $(PACKAGE_DIR) && find $(TARFILE_ROOTDIR) -type d -exec chmod a+x {{}} \;
+    @cd $(PACKAGE_DIR) && chmod -R +rwX $(TARFILE_ROOTDIR) && $(TOUCH) $(UNTAR_FLAG_FILE)
 
 #add new files to patch
 $(PACKAGE_DIR)/$(ADD_FILES_FLAG_FILE) : $(PACKAGE_DIR)/$(UNTAR_FLAG_FILE) $(T_ADDITIONAL_FILES:+".dummy")