php-geoip: fix legal info

The LICENSE file is gone, so use the lone .c source fle. Fixes:
http://autobuild.buildroot.net/results/acd/acd763e7eefb8be2bbd0bf973bb7855fceee7377/

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/php-geoip/php-geoip.mk

@@ -11,7 +11,7 @@ PHP_GEOIP_CONF_OPTS = --with-php-config=$(STAGING_DIR)/usr/bin/php-config \
 # phpize does the autoconf magic
 PHP_GEOIP_DEPENDENCIES = geoip php host-autoconf
 PHP_GEOIP_LICENSE = PHP
-PHP_GEOIP_LICENSE_FILES = LICENSE
+PHP_GEOIP_LICENSE_FILES = geoip.c
 
 define PHP_GEOIP_PHPIZE
 	(cd $(@D); \