Fix $version_finder space in current dir

DB<44> x "$perl $version_finder < $prereq_input"
0  '/usr/bin/perl /cygdrive/d/data/urbanr/My Documents/.cpan/build/CPAN-Reporter-1.1800/blib/lib/CPAN/Reporter/PrereqCheck.pm < /tmp/CPAN-Reporter-PI-1giFSOv3'
  DB<45> n
Can't open perl script "/cygdrive/d/data/urbanr/My": No such file or directory

diff -u CPAN-Reporter-1.1800/lib/CPAN/Reporter.pm~ CPAN-Reporter-1.1800/lib/CPAN/Reporter.pm
--- CPAN-Reporter-1.1800/lib/CPAN/Reporter.pm~	2010-07-26 22:03:04.000000000 +0200
+++ CPAN-Reporter-1.1800/lib/CPAN/Reporter.pm	2010-08-12 08:37:03.709507900 +0200
@@ -1365,7 +1365,7 @@
 #
 #--------------------------------------------------------------------------#
 
-my $version_finder = $INC{'CPAN/Reporter/PrereqCheck.pm'};
+my $version_finder = quotemeta($INC{'CPAN/Reporter/PrereqCheck.pm'});
 
 sub _version_finder {
     my %prereqs = @_;