[Issue 19716] New: activate and activate.fish scripts do not add MANPATH

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19716

          Issue ID: 19716
           Summary: activate and activate.fish scripts do not add MANPATH
           Product: D
           Version: D2
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: installer
          Assignee: nobody at puremagic.com
          Reporter: dlang at rydb3rg.com

After use of `source ~/dlang/dmd-2.085.0/activate` and/or `source
~/dlang/dmd-2.085.0/activate.fish` they do not include the MANPATH environment
variable, thus unable to look up, e.g., man rdmd, man dmd, or man dmd.conf.

Suggest modifying `script/install.sh` to add MANPATH to activate source
scripts.

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