Set the pkgconfig binary name in cross file #31

Without this you can't cross compile on Fedora 32, not sure why this is
needed since it worked fine on earlier versions and pkg-config seems to
get detected correctly on any other distro.

cross-wine.conf

@@ -3,6 +3,8 @@ c = 'winegcc'
 cpp = 'wineg++'
 ar = 'ar'
 strip = 'strip'
+# Needs to be specified explicitely for Fedora 32
+pkgconfig = 'pkg-config'
 
 [properties]
 # Instead of specifying the target architecture below, we'll do this directly in