Fixes #544

Including `<iostream>` allows LDC to compile correctly on some Macs running OS X Mavericks.
Merge pull request #583 from itaiferber/master

Fixes #544
Merge branch 'master' into merge-2.064
Add macros which are removed in LLVM trunk.
Fix to compile LDC on FreeBSD 10.

This fixes issue #584.
Merge branch 'master' into merge-2.064
Merge branch 'merge-2.064' into merge-2.065

Conflicts:
	dmd2/root/port.c