mingw: Bump docker base to Fedora 23.

rillian · rillian · commit f4e0ed091f60 · 2016-01-04T16:07:17.000-08:00
This build works as well. I'm not sure what's wrong with my
local environment.
diff --git a/mingw/Dockerfile b/mingw/Dockerfile
@@ -1,10 +1,10 @@
-FROM fedora:22
+FROM fedora:23
 MAINTAINER opus@xiph.org
 
 # Linux build.
 RUN dnf update -y
 RUN dnf install -y git gcc make wget xz
-RUN dnf install -y autoconf automake libtool
+RUN dnf install -y autoconf automake libtool pkgconfig
 
 # mingw cross build.
 RUN dnf install -y mingw32-gcc zip
