ncmpc: disable documentation

Fixes:
 - http://autobuild.buildroot.org/results/4822b195628b3ce0d3fd6428bcba2cca158e92be

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 243118288ff40add3d8447c9240cc7e42ad36403)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/ncmpc/ncmpc.mk

@@ -12,7 +12,9 @@ NCMPC_DEPENDENCIES = host-pkgconf libglib2 libmpdclient ncurses
 NCMPC_LICENSE = GPL-2.0+
 NCMPC_LICENSE_FILES = COPYING
 
-NCMPC_CONF_OPTS = -Dcurses=ncurses
+NCMPC_CONF_OPTS = \
+	-Dcurses=ncurses \
+	-Ddocumentation=false
 
 ifeq ($(BR2_PACKAGE_LIRC_TOOLS),y)
 NCMPC_DEPENDENCIES += lirc-tools