Fix public issue #31: Don't reset PATH in autogen.sh; instead, do the trickery we need for our own build system internally. R=csilvers DELTA=16 (13 added, 1 deleted, 2 changed) Revision created by MOE tool push_codebase. MOE_MIGRATION=1555 git-svn-id: https://snappy.googlecode.com/svn/trunk@30 03e5f5b5-db94-4691-08a0-1a8bf15f6143