Test 1165 would fail on some systems because it didn't detect
CURL_DISABLE_* symbols that were used to the right of another one on the
same line! The script would only detect and extract the first one.
Reported-by: Marcel Raad
Fixes#8384Closes#8388
The disable-scan script used in test 1165 is extended to also verify
that the docs cover all used defines and all defines offered by
configure.
Reported-by: SLDiggie on github
Fixes#4545Closes#4587
