tor_bootstrap: convert cygwin pid to windows pid

TBBTestSuite/Tests/TorBootstrap.pm

 package TBBTestSuite::Tests::TorBootstrap;
 
 use strict;
+use English;
 use File::Slurp;
 use Cwd qw(getcwd);
 use TBBTestSuite::Common qw(exit_error winpath has_bin);
@@ -27,6 +28,10 @@ END {
     stop_httpproxy;
 }
 
+sub winpid {
+    $OSNAME eq 'cygwin' ? Cygwin::pid_to_winpid($_[0]) : $_[0];
+}
+
 sub monitor_bootstrap {
     my ($tbbinfos, $test, $control_passwd) = @_;
     sleep 10;
@@ -132,7 +137,7 @@ sub start_tor {
         '-f', winpath("$tbbinfos->{datadir}/Tor/torrc"),
         'DataDirectory', winpath("$tbbinfos->{datadir}/Tor"),
         'GeoIPFile', winpath("$tbbinfos->{datadir}/Tor/geoip"),
-        '__OwningControllerProcess', $$);
+        '__OwningControllerProcess', winpid($$));
     $tbbinfos->{torpid} = fork;
     if ($tbbinfos->{torpid} == 0) {
         $ENV{LD_LIBRARY_PATH} = "$tbbinfos->{tbbdir}:$tbbinfos->{tordir}";