package/flashrom: disable documentation and man-pages

The build of the manpage currently fails with:

ERROR: File 'doc/man8' could not be found
FAILED: meson-internal__install

As we don't care about man pages and documentation in Buildroot, let's
disable them. The issue has nevertheless been reported at
https://github.com/flashrom/flashrom/issues/329.

Fixes:

  http://autobuild.buildroot.net/results/885a957d1b5305d3b91339487cc2a0d64dc74f5e/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/flashrom/flashrom.mk

@@ -15,7 +15,9 @@ FLASHROM_CONF_OPTS = \
 	-Dich_descriptors_tool=enabled \
 	-Dtests=disabled \
 	-Duse_internal_dmi=true \
-	-Dwerror=false
+	-Dwerror=false \
+	-Dman-pages=disabled \
+	-Ddocumentation=disabled
 
 FLASHROM_PROGRAMMERS = \
 	buspirate_spi \