Fix Issue 12668 -  std.traits.functionAttributes should use the new
getFunctionAttributes trait.
[reg] Fix 13210 : libphobos2.so not being built
Merge pull request #2131 from AndrejMitrovic/Fix12668

Issue 12668 -  std.traits.functionAttributes should use the new getFunctionAttributes trait.
Merge pull request #2377 from Dicebot/fix-13210-makefile-dll

[reg] Fix 13210 : libphobos2.so not being built
Made File.writeln infer @safe/@trusted/etc. Also wrapped stdout in @trusted private function so writeln (and family) free functions don't always infer @system.