Fix SCons whitespace issue (tabs/spaces)

Author: uklotzde

build/depends.py

@@ -30,8 +30,8 @@ def configure(self, build, conf):
         return
 
     def sources(self, build):
-    	if build.platform_is_osx:
-        	return ['util/filepathurl.mm']
+        if build.platform_is_osx:
+            return ['util/filepathurl.mm']
         return []