THRIFT-4474: Use PSR-4 autoloader by default

Client: php

This closes #1479
diff --git a/lib/php/test/Makefile.am b/lib/php/test/Makefile.am
index 5c86e35..4824688 100755
--- a/lib/php/test/Makefile.am
+++ b/lib/php/test/Makefile.am
@@ -20,8 +20,8 @@
 PHPUNIT=php $(top_srcdir)/vendor/bin/phpunit
 
 stubs: ../../../test/ThriftTest.thrift  TestValidators.thrift
-	mkdir -p ./packages
-	$(THRIFT) --gen php -r --out ./packages ../../../test/ThriftTest.thrift
+	mkdir -p ./packages/php
+	$(THRIFT) --gen php -r --out ./packages/php ../../../test/ThriftTest.thrift
 	mkdir -p ./packages/phpv
 	mkdir -p ./packages/phpvo
 	mkdir -p ./packages/phpjs