Bug 24628 – Display of linkage in the compiler versus docs and examples

In the vast majority of uses, linkage is expressed without a space: e.g. `extern(C)` instead `extern (C)`, however, when DMD displays linkage, it inserts this space. ```d extern(C) void f() { } pragma(msg, typeof(&f)); ``` Prints: ``` extern (C) void function() ``` Expected: ``` extern(C) void function() ```

The spec uses a space, see code examples: https://dlang.org/spec/attribute.html#linkage The files I have open from dmd use a space by about 4:1. Not saying what's best, just providing some data points.

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