package/patch: fix xattr option

The name of the configure option is, and has always been,
 --enable-xattr, not --enable-attr. Otherwise, configure
whines:
    configure: WARNING: unrecognized options: --enable-attr

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/patch/patch.mk

@@ -11,10 +11,10 @@ PATCH_LICENSE = GPL-3.0+
 PATCH_LICENSE_FILES = COPYING
 
 ifeq ($(BR2_PACKAGE_ATTR),y)
-PATCH_CONF_OPTS += --enable-attr
+PATCH_CONF_OPTS += --enable-xattr
 PATCH_DEPENDENCIES += attr
 else
-PATCH_CONF_OPTS += --disable-attr
+PATCH_CONF_OPTS += --disable-xattr
 endif
 
 $(eval $(autotools-package))