Add missing wxLogWarning() argument to wxDynamicLibrary test

The argument corresponding to the "%s" format specifier was missing,
which resulted in a crash if the dynamic library tested didn't actually
exist.

tests/misc/dynamiclib.cpp

@@ -61,7 +61,7 @@ void DynamicLibraryTestCase::Load()
     if ( !wxFileName::Exists(LIB_NAME) )
     {
         wxLogWarning("Shared library \"%s\" doesn't exist, "
-                     "skipping DynamicLibraryTestCase::Load() test.");
+                     "skipping DynamicLibraryTestCase::Load() test.", LIB_NAME);
         return;
     }
 #else