Increased parallelism of the ARM scons build to 8.  In tests on my older Opteron this reduces build times by 75%.
Increased parallelism of the ARM scons build to 8.  In tests on my older Opteron this reduces build times by 75%.

BUG= http://code.google.com/p/nativeclient/issues/detail?id=1079
Review URL: http://codereview.chromium.org/4118005

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@64281 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build