https://issues.dlang.org/show_bug.cgi?id=17175

          Issue ID: 17175
           Summary: make predefined version identifiers case insensitive
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: b2.temp@gmx.com

to avoid bugs such as

    version(Linux){} else {}

which can be hard to track depending on the version-relative-statements.

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