Core/GeckoCodeConfig : Fix Gecko codes formatting

Some locales (e.g. fr_FR.UTF-8 on ArchLinux) don't split the string stream on a space. As such, when extracted formatted data from te stream, it will return the two numbers as one for the first call, effectively overflowing the u32 variable, then will do an out-of-bounds read for the second call. Forcing the use of the C locale on the streams where it would cause a problem allows to workaround this behavior.

Source/Core/Core/GeckoCodeConfig.cpp

@@ -85,6 +85,11 @@ std::vector<GeckoCode> DownloadCodes(std::string gametdb_id, bool* succeeded)
     {
       std::istringstream ssline(line);
       std::string addr, data;
+
+      // Some locales (e.g. fr_FR.UTF-8) don't split the string stream on space
+      // Use the C locale to workaround this behavior
+      ssline.imbue(std::locale::classic());
+
       ssline >> addr >> data;
       ssline.seekg(0);
 
@@ -139,6 +144,10 @@ std::vector<GeckoCode> LoadCodes(const IniFile& globalIni, const IniFile& localI
     {
       std::istringstream ss(line);
 
+      // Some locales (e.g. fr_FR.UTF-8) don't split the string stream on space
+      // Use the C locale to workaround this behavior
+      ss.imbue(std::locale::classic());
+
       switch ((line)[0])
       {
       // enabled or disabled code