package/host-gdb: disable source-highlight

This is the follow-up commit to the 4de60e4 which disables
sourcehighlight dependency for the target GDB package.
Do the same for the host variant to be sure that this
won't be picked up from the host system.

Signed-off-by: Bartosz Bilas <b.bilas@grinn-global.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 9ba399a3ddfc3129c5334c558b52665053a932cb)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gdb/gdb.mk

@@ -255,6 +255,7 @@ HOST_GDB_CONF_OPTS = \
 	--with-system-zlib \
 	--with-curses \
 	--without-mpfr \
+	--disable-source-highlight \
 	$(GDB_DISABLE_BINUTILS_CONF_OPTS)
 
 ifeq ($(BR2_PACKAGE_HOST_GDB_TUI),y)