Fix spelling of "NaCl" in various places: "NaCL" is the wrong capitalisation

native_client_sdk/src/tools/create_nmf.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Tool for automatically creating .nmf files from .nexe/.pexe executables.
 
 As well as creating the nmf file this tool can also find and stage
 any shared libraries dependancies that the executables might have.
 """
@@ skipping 106 matching lines @@
     header = f.read(elf_header_size)
 
   try:
     header = struct.unpack(elf_header_format, header)
   except struct.error:
     raise Error("error parsing elf header: %s" % path)
   e_ident, _, e_machine = header[:3]
 
   elf_magic = '\x7fELF'
   if e_ident[:4] != elf_magic:
-    raise Error('Not a valid NaCL executable: %s' % path)
+    raise Error('Not a valid NaCl executable: %s' % path)
 
   e_machine_mapping = {
     3 : 'x86-32',
     40 : 'arm',
     62 : 'x86-64'
   }
   if e_machine not in e_machine_mapping:
     raise Error('Unknown machine type: %s' % e_machine)
 
   # Set arch based on the machine type in the elf header
@@ skipping 622 matching lines @@
 if __name__ == '__main__':
   try:
     rtn = main(sys.argv[1:])
   except Error, e:
     sys.stderr.write('%s: %s\n' % (os.path.basename(__file__), e))
     rtn = 1
   except KeyboardInterrupt:
     sys.stderr.write('%s: interrupted\n' % os.path.basename(__file__))
     rtn = 1
   sys.exit(rtn)