libfribidi: depend on host-pkgconf

libfribidi needs macros from pkgconf to generate its configure script. Since
commit 5693f236a2a0 (libfribidi: bump version) we AUTORECONF, so host-pkgconf
is also needed.

Fixes:
http://autobuild.buildroot.net/results/5d7/5d76a8333fb05e903460ad51dc0737c18431d033/

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libfribidi/libfribidi.mk

@@ -12,5 +12,6 @@ LIBFRIBIDI_LICENSE_FILES = COPYING
 LIBFRIBIDI_INSTALL_STAGING = YES
 # BR's libtool patch doesn't apply
 LIBFRIBIDI_AUTORECONF = YES
+LIBFRIBIDI_DEPENDENCIES = host-pkgconf
 
 $(eval $(autotools-package))