Make build work when Erlang is installed in nonstandard location
Make build work when Erlang is installed in nonstandard location

Scripts run from Xcode builds don't have $PATH set to look in /usr/local or /opt, where package managers install erlc. Fixed this by manually extending the path.

Change-Id: Ia308051c06475a1822e2dc32fc61fdc0a3a277e7

couchbase/iOS-Couchbase,couchbase/iOS-Couchbase