[build] remove unused script

scripts/export-xcconfig.py

@@ -1,20 +0,0 @@
-#!/usr/bin/env python
-
-import sys, ast, re
-
-ILLEGAL_CHAR_RE = re.compile(r"\W")
-
-def main():
-    with open(sys.argv[1], "r") as in_file, open(sys.argv[2], "w") as out_file:
-        config = ast.literal_eval(in_file.read())
-        variables = ["// Do not edit -- generated by export-xcconfig.py\n"]
-        assert(type(config) is dict)
-        assert(type(config["variables"]) is dict)
-        for variable, flags in config["variables"].iteritems():
-            variable = ILLEGAL_CHAR_RE.sub("_", variable.rstrip("%"))
-            flags = " ".join('"%s"' % flag for flag in flags)
-            variables.append("%s = %s\n" % (variable, flags))
-        out_file.writelines(variables)
-
-if __name__ == '__main__':
-    main()