QA api test: ensure the "C" locale is used in tests.

Fix also a compatibility with current code in drc_proto.cpp

qa/tests/api/test_api_module.cpp

@@ -23,7 +23,7 @@
 #include <mock_pgm_base.h>
 #include <pgm_base.h>
 #include <qa_utils/wx_utils/wx_assert.h>
-
+#include <locale_io.h>
 
 bool init_unit_test()
 {
@@ -33,6 +33,9 @@ bool init_unit_test()
 
     wxApp::SetInstance( new wxAppConsole );
 
+    // Ensure the "C" locale is used
+    LOCALE_IO dummy;
+
     bool ok = wxInitialize( boost::unit_test::framework::master_test_suite().argc,
                             boost::unit_test::framework::master_test_suite().argv );