make config.sh executable for cross-bulding
make config.sh executable for cross-bulding

Change-Id: I37358cf8523e3f9d5a656146275ce638bb380e18
Reviewed-on: http://review.membase.org/4775
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

zbase/ep-engine,couchbase/ep-engine,sriganes/ep-engine,hisundar/ep-engine,owendCB/ep-engine,owendCB/ep-engine,daverigby/kv_engine,abhinavdangeti/ep-engine,membase/ep-engine,membase/ep-engine,teligent-ru/ep-engine,abhinavdangeti/ep-engine,daverigby/kv_engine,daverigby/ep-engine,daverigby/ep-engine,sriganes/ep-engine,zbase/ep-engine,couchbaselabs/ep-engine,sriganes/ep-engine,zbase/ep-engine,hisundar/ep-engine,couchbaselabs/ep-engine,couchbase/ep-engine,abhinavdangeti/ep-engine,daverigby/ep-engine,membase/ep-engine,jimwwalker/ep-engine,couchbaselabs/ep-engine,hisundar/ep-engine,membase/ep-engine,teligent-ru/ep-engine,teligent-ru/ep-engine,abhinavdangeti/ep-engine,couchbaselabs/ep-engine,couchbase/ep-engine,sriganes/ep-engine,daverigby/ep-engine,jimwwalker/ep-engine,jimwwalker/ep-engine,zbase/ep-engine,teligent-ru/ep-engine,daverigby/kv_engine,abhinavdangeti/ep-engine,daverigby/kv_engine,owendCB/ep-engine,owendCB/ep-engine,jimwwalker/ep-engine,couchbase/ep-engine,couchbaselabs/ep-engine,zbase/ep-engine,hisundar/ep-engine