Make std.stdio.LockingTextWriter.put and lockingTextWriter @safe
Make trustedFwrite static
Make trustedFPUTC and trustedFPUTWC static
Add static keyword to trustedFPUTC/trustedFPUTWC
Merge pull request #2225 from tom-tan/trusted-stdio-LockingTextWriter-put

Make std.stdio.LockingTextWriter.put and lockingTextWriter @safe