llvm wrapper: Put -lcrt_platform after -lnacl
llvm wrapper: Put -lcrt_platform after -lnacl

libnacl depends on libcrt_platform, so libnacl must come before
libcrt_platform (as in the x86 nacl-gcc spec file) or be in the same
--start-group/--end-group group.

The current ordering only works when callers pass an extra -lnacl to
llvm-fake.py.  Fixing this lets us remove "LIBS=['c', 'nacl']" from
various Scons files.

BUG=http://code.google.com/p/nativeclient/issues/detail?id=631

Review URL: http://codereview.chromium.org/2863016

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@2553 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client