Cygwin: resolver: more fixes

[Anton Lavrentiev via Cygwin-patches]

Proposed are two fixes for more little bugs in the resolver.  The first
one fixes the ID field returned in the response to match the ID of the
request (even in the case when the OS-supplied native resolver is used).
The second one is about the standard compliance (when the response is
relayed from the native OS resolver):  the targets in SRV records
should never be compressed.