xdebug: Add missing dep on re2c-native

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-webserver/recipes-php/xdebug/xdebug_2.6.0.bb

@@ -2,7 +2,7 @@ SUMMARY = "Debugging and profiling extension for PHP"
 LICENSE = "Xdebug"
 LIC_FILES_CHKSUM = "file://LICENSE;md5=34df3a274aa12b795417c65634c07f16"
 
-DEPENDS = "php"
+DEPENDS = "php re2c-native"
 
 SRC_URI = "http://xdebug.org/files/xdebug-${PV}.tgz"