package/lynx: add dependency on host-pkgconf

The Lynx configure script uses pkg-config when available:

checking for nios2-buildroot-linux-gnu-pkg-config... /home/thomas/projets/buildroot/output/host/bin/pkg-config
checking pkg-config for openssl... yes
[...]
checking pkg-config for ncurses... yes

Using pkg-config avoids build failures such as:

checking for _nc_freeall... no
configure: error: Configuration does not support color-styles
make: *** [/home/test/autobuild/run/instance-1/output/build/lynx-2.8.9rel.1/.stamp_configured] Error 1

When building with "make lynx", so that pkg-config is not built
before. The issue is that in this case, lynx configure script picks up
the ncurses6-config script for the host ncurses instead of the one in
staging. Using pkg-config solves that nicely.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 67ee7f9eb1bce1542e0a8845d492635151dce36e)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/lynx/lynx.mk

@@ -10,7 +10,7 @@ LYNX_SITE = ftp://ftp.invisible-island.net/lynx/tarballs
 LYNX_LICENSE = GPL-2.0
 LYNX_LICENSE_FILES = COPYING
 
-LYNX_DEPENDENCIES = $(TARGET_NLS_DEPENDENCIES)
+LYNX_DEPENDENCIES = host-pkgconf $(TARGET_NLS_DEPENDENCIES)
 
 ifeq ($(BR2_PACKAGE_NCURSES),y)
 LYNX_DEPENDENCIES += ncurses