Cleanup build system

Remove old Makefiles
Move hello_world_newlib -> hello_world
Remove hello_world_glibc
Remove hello_world_pnacl

TBR=binji@chromium.org
BUG=130618

Review URL: https://chromiumcodereview.appspot.com/10541180

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@142322 0039d316-1c4b-4281-b951-d872f2087c98
27 files changed