[Issue 20408] New: style checker should not check backup files

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20408

          Issue ID: 20408
           Summary: style checker should not check backup files
           Product: D
           Version: D2
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: bugzilla at d-ecke.de

When running

make -f posix.mak style

I sometimes get a failure pointing to std.file.d~ or similar. IMHO the style
checker should not check these backup files.

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