php: add version to license string

As per LICENSE file, php uses PHP license version 3.01.

Signed-off-by: Rahul Bedarkar <rahulbedarkar89@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/php/php.mk

@@ -11,7 +11,7 @@ PHP_INSTALL_STAGING = YES
 PHP_INSTALL_STAGING_OPTS = INSTALL_ROOT=$(STAGING_DIR) install
 PHP_INSTALL_TARGET_OPTS = INSTALL_ROOT=$(TARGET_DIR) install
 PHP_DEPENDENCIES = host-pkgconf
-PHP_LICENSE = PHP
+PHP_LICENSE = PHP-3.01
 PHP_LICENSE_FILES = LICENSE
 PHP_CONF_OPTS = \
 	--mandir=/usr/share/man \