[Bug 7634] New: exit status 127 if applet not found

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7634

           Summary: exit status 127 if applet not found
           Product: Busybox
           Version: 1.22.x
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Standard Compliance
        AssignedTo: unassigned at busybox.net
        ReportedBy: mantoxpub at people.it
                CC: busybox-cvs at busybox.net
   Estimated Hours: 0.0


if the applet is not found, return the exit status 127 instead of 1 as the
POSIX standard suggests:
http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_08_02

This is useful for scripting purposes, for instance:
echo 1+2 | busybox bc
if [ $? -ne 127 ]; then ...

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