Make /sbin/ldconfig explicite as scriptlet and don't use the advanced syntax,...

Make /sbin/ldconfig explicite as scriptlet and don't use the advanced syntax, which isn't supported on RHEL.

extras/contrib/src/Patches/x264.spec

@@ -37,7 +37,8 @@ cd -
 /usr/lib/libx264.so
 /usr/lib/libx264.so.54
 
-%post -p /sbin/ldconfig
+%post
+/sbin/ldconfig
 #ln -s /usr/lib/libx264.so.45 /usr/lib/libx264.so
 
 %package devel