pgsql: Handle spaces for Python install location in MSVC scripts

Handle spaces for Python install location in MSVC scripts

Attempting to use an installation path of Python that includes spaces
caused the MSVC builds to fail. This fixes the issue by using the same
quoting method as ad7595b for OpenSSL.

Author: Victor Wagner
Discussion: /messages/by-id/20200430150608.6dc6b8c4@antares.wagner.home
Backpatch-through: 9.5

Branch
------
REL_10_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/307ed98b01394488b9bd1dfa7a851a219c7e27ab

Modified Files
--------------
src/tools/msvc/Mkvcbuild.pm | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)