Make -Werror disabling file only

Ad fix a load of warnings

src/IniFile.cpp

@@ -859,7 +859,7 @@ AString cIniFile::CheckCase(const AString & s) const
 	size_t len = res.length();
 	for (size_t i = 0; i < len; i++)
 	{
-		res[i] = tolower(res[i]);
+		res[i] = static_cast<char>(tolower(res[i]));
 	}
 	return res;
 }