pgsql: Fix TAP tests and MSVC scripts for pathnames with spaces.

Fix TAP tests and MSVC scripts for pathnames with spaces.

Change assorted places in our Perl code that did things like
system("prog $path/file");
to do it more like
system('prog', "$path/file");
which is safe against spaces and other special characters in the path
variable. The latter was already the prevailing style, but a few bits
of code hadn't gotten this memo. Back-patch to 9.4 as relevant.

Michael Paquier, Kyotaro Horiguchi

Discussion: <20160704(dot)160213(dot)111134711(dot)horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>

Branch
------
REL9_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/02a898b00cd9f7175691b58fb567b51a53bdaad2

Modified Files
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src/tools/msvc/Install.pm | 32 ++++++++++++++++++++++----------
src/tools/msvc/vcregress.pl | 20 +++++++++++++-------
2 files changed, 35 insertions(+), 17 deletions(-)