Remove checking for existance of build directory

Author: theotherjimmy

tools/build.py

@@ -46,7 +46,7 @@
     parser.add_argument("--source", dest="source_dir", type=argparse_filestring_type,
                         default=None, help="The source (input) directory", action="append")
 
-    parser.add_argument("--build", dest="build_dir", type=argparse_filestring_type,
+    parser.add_argument("--build", dest="build_dir",
                       default=None, help="The build (output) directory")
 
     parser.add_argument("--no-archive", dest="no_archive", action="store_true",