[NaCl SDK] Cleanup references to old newlib toolchain

native_client_sdk/src/build_tools/nacl.gypi

-{
-  # gyp only supports two toolchains: host and target.
-  # In order to get around this limitation we use a compiler
-  # wrapper than will then invoke either the glibc or the newlib
-  # compiler.
-  'make_global_settings': [
-    ['CC.target'   , '../../toolchain/linux_x86/bin/i686-nacl-gcc'],
-    ['CXX.target'  , '../../toolchain/linux_x86/bin/i686-nacl-g++'],
-    ['LINK.target' , '../../toolchain/linux_x86/bin/i686-nacl-g++'],
-    ['AR.target'   , '../../toolchain/linux_x86/bin/i686-nacl-ar'],
-  ],
-
-  'variables': {
-    'EXECUTABLE_SUFFIX': '.nexe',
-    'TOOLROOT': '../../toolchain',
-    'OBJDUMP': '<(TOOLROOT)/linux_x86_glibc/bin/i686-nacl-objdump',
-    'NMF_PATH1': '<(TOOLROOT)/linux_x86_glibc/x86_64-nacl/lib32',
-    'NMF_PATH2': '<(TOOLROOT)/linux_x86_glibc/x86_64-nacl/lib',
-  },
-
-  'target_defaults': {
-    'link_settings': { 'ldflags': ['-Wl,-as-needed'] },
-    'libraries' : ['-lppapi', '-lppapi_cpp'],
-    'ldflags': ['-pthread'],
-    'cflags': ['-pthread', '-Wno-long-long', '-Wall', '-Wswitch-enum', '-Werror'],
-  },
-}