package/pango: add dependency on libfribidi

package/pango: add dependency on libfribidi

Since commit 5cce413eb11ac75f5c48ed351896c5d1c33961d5 ("package/pango:
bump to version 1.44.6"), pango needs libfribidi. Through the Meson
subprojects mechanism, it tries to download it by itself if not
available. But in Buildroot, we definitely want to use the separate
libfribidi package, so let's add it as a dependency of pango.

Fixes:
  http://autobuild.buildroot.net/results/f16fda910da23dfe5f8ac1cb51f9dbcec444b516

  subprocess.CalledProcessError: Command '['git', 'clone', 'https://github.com/fribidi/fribidi.git', 'fribidi']' returned non-zero exit status 128.

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>