[Issue 18168] std.base64.encode for output ranges should be usable in @safe

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18168

Seb <greensunny12 at gmail.com> changed:

           What    |Removed                     |Added
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             Blocks|                            |18110


Referenced Issues:

https://issues.dlang.org/show_bug.cgi?id=18110
[Issue 18110] most of phobos should be @safe-ly useable
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