[NaCl SDK] A bunch of spelling fixes.

native_client_sdk/src/build_tools/library.mk

 # 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.
 
 #
 # GNU Make based build file.  For details on GNU Make see:
 #   http://www.gnu.org/software/make/manual/make.html
 #
 #
 
 # Default configuration
 #
-# By default we will build a Debug configuration using the GCC newlib toolcahin
+# By default we will build a Debug configuration using the GCC newlib toolchain
 # to override this, specify TOOLCHAIN=newlib|glibc or CONFIG=Debug|Release on
 # the make command-line or in this file prior to including common.mk.  The
 # toolchain we use by default will be the first valid one listed
 VALID_TOOLCHAINS:={{' '.join(tools)}}
 
 
 [[# Only one target is allowed in a library project]]
 [[target = targets[0] ]]
 [[name = target['NAME'] ]]
 [[flags = ' '.join(target.get('CCFLAGS', []))]]
@@ skipping 30 matching lines @@
 
 #
 # Use the compile macro for each source.
 #
 $(foreach src,$(SOURCES),$(eval $(call COMPILE_RULE,$(src),{{flags}})))
 
 #
 # Use the lib macro for this target on the list of sources.
 #
 $(eval $(call LIB_RULE,{{name}},$(SOURCES)))