Fix bug#27520. For some unknown reason, libtool.m4 attempts
to find "ar" but if it cannot be found sets AR=false. This leads to confusing failures during the build rather than at configure time. We have our own checks for ar, but as AR was already set earlier by the libtool tests they were never exectuted. Therefore, update the tests so that we catch any libtool failures, and run AC_CHECK_PROG explicitly to ensure that we see sensible output from configure prior to any potential failure. config/ac-macros/misc.m4: AC_CHECK_PROG does nothing if the first argument (variable) is already set, so remove redundant check for the empty string. This also ensures that a 'checking for ar' message is printed prior to any failure, which is far less confusing.
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