this fixes a bug in the nacl.scons file, where the sdk build tries to parse/execute nacl.scons, w/ TARGET_ARCHITECTURE defined but no TRUSTED_ENV, so there are no platform-specific thread limits available, leaving a variable undefined.
this fixes a bug in the nacl.scons file, where the sdk build tries to
parse/execute nacl.scons, w/ TARGET_ARCHITECTURE defined but no
TRUSTED_ENV, so there are no platform-specific thread limits
available, leaving a variable undefined.

Review URL: http://codereview.chromium.org/983003

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@1725 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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