[ModuleLoader] strip away Unixy './' in module path

This prevented the lookup from working on Linux. Works now.

Author: Carl Masak

src/ModuleLoader.pm

@@ -123,6 +123,9 @@ knowhow ModuleLoader {
         # May be fake executable, so may not end in .pbc. If so, add it.
         # Strip any .exe.
         my $module_name := ((pir::getinterp__P())[2])[0];
+        if pir::substr($module_name, 0, 2) eq './' {
+            $module_name := pir::substr($module_name, 2, pir::length($module_name) - 2);
+        }
         if pir::substr($module_name, pir::length($module_name) - 4, 4) eq '.pbc' {
             # Fine as it is.
         }