pgsql: Make configure check for a couple more Perl modules for --enable

Make configure check for a couple more Perl modules for --enable-tap-tests.

Red Hat's notion of a basic Perl installation doesn't include Test::More
or Time::HiRes, and reportedly some Debian installs also omit Time::HiRes.
Check for those during configure to spare the user the pain of digging
through check-world output to find out what went wrong. While we're at it,
we should also check the version of Test::More, since TestLib.pm requires
at least 0.87.

In principle this could be back-patched, but it's probably not necessary.

Discussion: https://postgr.es/m/516.1521475003@sss.pgh.pa.us

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/264eb03aab067da6db2a0de907a8421ce6865d60

Modified Files
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configure | 10 ++++++++--
configure.in | 6 ++++--
2 files changed, 12 insertions(+), 4 deletions(-)