[Issue 18394] New: wrong `dmd --version` when building from git master: shows last tag instead of new one

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18394

          Issue ID: 18394
           Summary: wrong `dmd --version` when building from git master:
                    shows last tag instead of new one
           Product: D
           Version: D2
          Hardware: x86
                OS: Mac OS X
            Status: NEW
          Severity: minor
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: timothee.cour2 at gmail.com

git rev-parse HEAD
7e8bea0e83314f39b8c8b2bddbfbff2b0bdee74d


dmd --version
DMD v2.078.2-beta.1-653-g7e8bea0e8 DEBUG
DMD64 D Compiler v2.078.2-beta.1-653-g7e8bea0e8
Copyright (C) 1999-2018 by The D Language Foundation, All Rights Reserved
written by Walter Bright

should show instead the next version, ie something like:
v2.079-653-g7e8bea0e8 DEBUG

this is confusing in bug reports (eg
https://issues.dlang.org/show_bug.cgi?id=18393 where dmd --version showed
v2.078.2-beta.1-653-g7e8bea0e8 even though bug affects master, not
2.078.2-beta.1)

basically as soon as one creates a release tag (eg v2.078) the version
identifier __VERSION__ should be bumped in git master

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