Better error handling for -include of URL resources.
Better error handling for -include of URL resources.

- When user supplies a valid URL, now reports specific errors relating
to failures in including the named resource.
- No longer gives spurious errors after valid URL includes.

Fixes #1534

Signed-off-by: Elias N Vasylenko <3f26e9259e5a13cdc2a4ab7ba769fd0d0be6ce33@gmail.com>
mcculls/bnd,psoreide/bnd,mcculls/bnd,psoreide/bnd,lostiniceland/bnd,magnet/bnd,mcculls/bnd,magnet/bnd,lostiniceland/bnd,magnet/bnd,psoreide/bnd,lostiniceland/bnd