Make --build-tool=make the default on linux in compile.py.
Make --build-tool=make the default on linux in compile.py.

This will remove uncertainity.

I don't think scons is used by default anywhere. The only exception is V8 and
they already use --build-tools=scons_v8.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/6588126

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@76570 0039d316-1c4b-4281-b951-d872f2087c98

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