small fix to enable the test suite to find executables and scripts on Windows

mysql-test/lib/mtr_misc.pl:
  if running on win32, check for the existence of the file rather than it being executable

mysql-test/lib/mtr_misc.pl

@@ -82,9 +82,16 @@ sub mtr_path_exists (@) {
 
 sub mtr_script_exists (@) {
   foreach my $path ( @_ )
+  {
+    if($::glob_win32)
+    {
+      return $path if -f $path;
+    }
+    else
     {
       return $path if -x $path;
     }
+  }
   if ( @_ == 1 )
   {
     mtr_error("Could not find $_[0]");
@@ -107,9 +114,16 @@ sub mtr_exe_exists (@) {
   my @path= @_;
   map {$_.= ".exe"} @path if $::glob_win32;
   foreach my $path ( @path )
+  {
+    if($::glob_win32)
+    {
+      return $path if -f $path;
+    }
+    else
     {
       return $path if -x $path;
     }
+  }
   if ( @path == 1 )
   {
     mtr_error("Could not find $path[0]");