THRIFT-4474: Use PSR-4 autoloader by default

Client: php

This closes #1479
diff --git a/test/php/Makefile.am b/test/php/Makefile.am
index 28357f6..72f7fc5 100755
--- a/test/php/Makefile.am
+++ b/test/php/Makefile.am
@@ -20,8 +20,8 @@
 stubs: ../ThriftTest.thrift
 	$(THRIFT) --gen php ../ThriftTest.thrift
 	$(THRIFT) --gen php:inlined ../ThriftTest.thrift
-	$(MKDIR_P) gen-php-psr4
-	$(THRIFT) -out gen-php-psr4 --gen php:psr4 ../ThriftTest.thrift
+	$(MKDIR_P) gen-php-classmap
+	$(THRIFT) -out gen-php-classmap --gen php ../ThriftTest.thrift
 
 php_ext_dir:
 	mkdir -p php_ext_dir
@@ -33,7 +33,7 @@
 check: stubs php_ext_dir
 
 clean-local:
-	$(RM) -r gen-php gen-phpi gen-php-psr4 php_ext_dir
+	$(RM) -r gen-php gen-phpi gen-php-classmap php_ext_dir
 
 client: stubs php_ext_dir
 	php TestClient.php