php: bump to version 5.5.17

Add hash and switch to xz download for space savings.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/php/php.hash

@@ -0,0 +1,2 @@
+# From http://php.net/downloads.php
+md5	e5f25dae73004658533ee7701a527bd0	php-5.5.17.tar.xz

package/php/php.mk

@@ -4,8 +4,9 @@
 #
 ################################################################################
 
-PHP_VERSION = 5.5.16
+PHP_VERSION = 5.5.17
 PHP_SITE = http://www.php.net/distributions
+PHP_SOURCE = php-$(PHP_VERSION).tar.xz
 PHP_INSTALL_STAGING = YES
 PHP_INSTALL_STAGING_OPT = INSTALL_ROOT=$(STAGING_DIR) install
 PHP_INSTALL_TARGET_OPT = INSTALL_ROOT=$(TARGET_DIR) install