pull PHP_HOME from php.sh

toolset/setup/linux/frameworks/phalcon.sh

@@ -1,13 +1,12 @@
 #!/bin/bash
 
+fw_depends php
+
 RETCODE=$(fw_exists ${IROOT}/phalcon.installed)
 [ ! "$RETCODE" == 0 ] || { \
   source $IROOT/phalcon.installed
   return 0; }
 
-PHP_VERSION="5.5.17"
-PHP_HOME=$IROOT/php-$PHP_VERSION
-
 fw_get -O https://github.com/phalcon/cphalcon/archive/phalcon-v1.3.2.tar.gz
 fw_untar phalcon-v1.3.2.tar.gz
 cd cphalcon-phalcon-v1.3.2/build/64bits