Bug#23865 mysql-test-run.pl on Windows only supports debug and release configurations

Visual Studio builds each configuration in a different sub-directory.  Only the sub-
directories for release and debug are currently searched.

mysql-test/lib/mtr_misc.pl

@@ -66,6 +66,9 @@ sub mtr_add_arg ($$@) {
 
 ##############################################################################
 
+# Note - More specific paths should be given before less specific.  For examle
+# /client/debug should be listed before /client
+
 sub mtr_path_exists (@) {
   foreach my $path ( @_ )
   {
@@ -81,6 +84,9 @@ sub mtr_path_exists (@) {
   }
 }
 
+# Note - More specific paths should be given before less specific.  For examle
+# /client/debug should be listed before /client
+
 sub mtr_script_exists (@) {
   foreach my $path ( @_ )
   {
@@ -103,6 +109,9 @@ sub mtr_script_exists (@) {
   }
 }
 
+# Note - More specific paths should be given before less specific.  For examle
+# /client/debug should be listed before /client
+
 sub mtr_file_exists (@) {
   foreach my $path ( @_ )
   {
@@ -111,6 +120,9 @@ sub mtr_file_exists (@) {
   return "";
 }
 
+# Note - More specific paths should be given before less specific.  For examle
+# /client/debug should be listed before /client
+
 sub mtr_exe_maybe_exists (@) {
   my @path= @_;
 
@@ -129,6 +141,9 @@ sub mtr_exe_maybe_exists (@) {
   return "";
 }
 
+# Note - More specific paths should be given before less specific.  For examle
+# /client/debug should be listed before /client
+
 sub mtr_exe_exists (@) {
   my @path= @_;
   if (my $path= mtr_exe_maybe_exists(@path))