THRIFT-854. php: Provide configure option and make rules to build/install php extension

This patch adds a make target in lib/php that builds the php extension. By default configure will attempt to build this, but it can be disabled with --without-php_extension.

Patch: Anthony Molinaro

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@989226 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/bootstrap.sh b/bootstrap.sh
index 74ecdb8..52d5a51 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -20,6 +20,7 @@
 #
 
 ./cleanup.sh
+(cd lib/php/src/ext/thrift_protocol && phpize)
 
 autoscan || exit 1
 aclocal -I ./aclocal || exit 1