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: https://postgr.es/m/20200430150608.6dc6b8c4@antares.wagner.home
Backpatch-through: 9.5

diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index a083ac77f6ede6c4797738be3e43876e1958c5de..e08ea61cfb59fc95f2de7caeac7efbaa12193d3a 100644 (file)
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -487,7 +487,7 @@ sub mkvcbuild
        my $pythonprog = "import sys;print(sys.prefix);"
          . "print(str(sys.version_info[0])+str(sys.version_info[1]))";
        my $prefixcmd =
-         $solution->{options}->{python} . "\\python -c \"$pythonprog\"";
+         qq("$solution->{options}->{python}\\python" -c "$pythonprog");
        my $pyout = `$prefixcmd`;
        die "Could not query for python version!\n" if $?;
        my ($pyprefix, $pyver) = split(/\r?\n/, $pyout);