This check was not functioning properly for the following reasons:

* The "DropSite" and "DropLocation" CTest Configurations do not
get set until ctest_submit() is called.  So if ctest_submit()
was not called before ctest_test() we would end up with uncompressed
output, even if the CDash server was new enough to support this feature.

* CDash's API is now versioned. The current location to query is
now /api/v1/getversion.php, not /api/getversion.php.

As a result of these issues, CTest would not compress test/memcheck
output when it should.  Rather than fix this check, we now assume that
CTest is communicating with a new enough version of CDash.  This behavior
can be controlled through the use of the --no-compress-output command-line
argument.