test_options_validate__control fails on Windows because there are no ControlSockets

This is another issue with #17076 (moved).

Windows does not have unix sockets, so the error message and return value should be different.

https://jenkins.torproject.org/job/tor-ci-mingwcross-test/501/ARCHITECTURE=amd64,SUITE=jessie/console

02:58:18 options/validate__control: [forking] fixme:toolhelp:CreateToolhelp32Snapshot Unimplemented: heap list snapshot
02:58:18 fixme:toolhelp:Heap32ListFirst : stub
02:58:18 fixme:toolhelp:CreateToolhelp32Snapshot Unimplemented: heap list snapshot
02:58:18 fixme:toolhelp:Heap32ListFirst : stub
02:58:18 fixme:toolhelp:CreateToolhelp32Snapshot Unimplemented: heap list snapshot
02:58:18 fixme:toolhelp:Heap32ListFirst : stub
02:58:18 
02:58:18   FAIL src/test/test_options.c:3230: assert(ret OP_EQ 0): -1 vs 0
02:58:18   [validate__control FAILED]