[util] Move toLower transform to function

src/util/config/config.cpp

@@ -635,8 +635,7 @@ namespace dxvk {
           I             begin,
           I             end,
           V&            value) {
-    std::transform(str.begin(), str.end(), str.begin(),
+    str = Config::toLower(str);
-      [] (unsigned char c) { return (c >= 'A' && c <= 'Z') ? (c + 'a' - 'A') : c; });
 
     for (auto i = begin; i != end; i++) {
       if (str == i->first) {
@@ -708,4 +707,10 @@ namespace dxvk {
     }
   }
 
+  std::string Config::toLower(std::string str) {
+    std::transform(str.begin(), str.end(), str.begin(),
+      [] (unsigned char c) { return (c >= 'A' && c <= 'Z') ? (c + 'a' - 'A') : c; });
+    return str;
+  }
+
 }

src/util/config/config.h

@@ -102,6 +102,8 @@ namespace dxvk {
      */
     static Config getUserConfig();
 
+    static std::string toLower(std::string str);
+
   private:
 
     OptionMap m_options;
@@ -149,4 +151,4 @@ namespace dxvk {
     option |= state == Tristate::True;
   }
 
-}
+}