php: fix typo for fileinfo extension

As reported by Aleksandar <aleksandar.zivkovic@gmail.com> in bug #6140

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/php/php.mk

@@ -57,7 +57,7 @@ PHP_CONF_OPT += $(if $(BR2_PACKAGE_PHP_EXT_SOCKETS),--enable-sockets) \
 		$(if $(BR2_PACKAGE_PHP_EXT_CTYPE),--enable-ctype) \
 		$(if $(BR2_PACKAGE_PHP_EXT_FILTER),--enable-filter) \
 		$(if $(BR2_PACKAGE_PHP_EXT_CALENDAR),--enable-calendar) \
-		$(if $(BR2_PACKAGE_PHP_EXT_FILENIFO),--enable-fileinfo) \
+		$(if $(BR2_PACKAGE_PHP_EXT_FILEINFO),--enable-fileinfo) \
 		$(if $(BR2_PACKAGE_PHP_EXT_BCMATH),--enable-bcmath)
 
 ifeq ($(BR2_PACKAGE_PHP_EXT_OPENSSL),y)