Now that fmt plays nice with gcc let's actually use it: replace std::to_string, boost lexical_cast and a couple miscellaneous llformats with fmt. (Alchemy sync-ish)

indra/llui/lllineeditor.cpp

@@ -2475,7 +2475,7 @@ BOOL LLLineEditor::evaluateFloat()
 		else
 		{
 			// Replace the expression with the result
-			std::string result_str = llformat("%f", result);
+			std::string result_str = fmt::to_string(result);
 			setText(result_str);
 			selectAll();
 		}