[revert if broken] hhvm.check_return_type_hints=3

We want the option removed, but current value isn't the desired
behavior.
Doing this for some quick test signal.

Straight to master as it includes repo-auth changes.

Author: fredemmott

.deploy/build-repo.sh

@@ -11,6 +11,7 @@ echo "** Building repository"
 set -x
 hhvm --hphp --target hhbc \
   -l3 \
+  -d hhvm.check_return_type_hints=3 \
   --module src \
   --module vendor \
   --module build/final \

hhvm.dev.ini

@@ -4,3 +4,4 @@ hhvm.server.thread_count=20
 hhvm.hack_compiler_workers=4
 hhvm.jit_worker_threads=1
 hhvm.jit_worker_arenas=1
+hhvm.check_return_type_hints=3

hhvm.prod.ini

@@ -4,6 +4,7 @@ hhvm.server.error_document404=index.php
 hhvm.server.thread_count=20
 hhvm.jit_worker_threads=1
 hhvm.jit_worker_arenas=1
+hhvm.check_return_type_hints=3
 
 ; -----------------------------------
 ; -- REPO AUTH CONFIG STARTS HERE ---