std.stdio: Make makeGlobal @trusted

[VPanteleev-S7]

Fixes issue #10794

IDK if it makes sense but a function without arguments seems likely to have a memory-safe interface.

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[VPanteleev-S7]

Seems this is a known issue (see e.g. the private trustedStdout) and this change is wrong because the return value is ref so it's not thread safe...

[schveiguy]

see e.g. the private trustedStdout

This is also unsafe.

All this depends on nobody changing stdout from one thread and using it in another. This probably doesn't crash very often because people don't change these handles.

[VPanteleev-S7]

Yeah, probably that's why it's private.

[schveiguy]

Even private use is unsafe.