[Issue 13150] Add ability to log gagged compiler errors to file

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=13150

moonlightsentinel at disroot.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |moonlightsentinel at disroot.o
                   |                            |rg
         Resolution|---                         |FIXED

--- Comment #1 from moonlightsentinel at disroot.org ---
-verrors=spec was introduced in 2.072.0 which prints error messages from
speculative compiles.

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