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Fix detection of the AsynchDNS feature which not just depends on pthreads support, but also on whether USE_POSIX_THREADS is set or not. Caught by test 1014. This patch adds a new ENABLE_THREADED_RESOLVER option (corresponding to --enable-threaded-resolver of autotools) which also needs a check for HAVE_PTHREAD_H. For symmetry with autotools, CURL_USE_ARES is renamed to ENABLE_ARES (--enable-ares). Checks that test for the availability actually use USE_ARES instead as that is the result of whether a-res is available or not (in practice this does not matter as CARES is marked as required package, but nevertheless it is better to write the intent). Signed-off-by: Peter Wu <peter@lekensteyn.nl>