[Bug gprofng/32166] New: gprofn testsuite uses non-portable which

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=32166

            Bug ID: 32166
           Summary: gprofn testsuite uses non-portable which
           Product: binutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gprofng
          Assignee: vladimir.mezentsev at oracle dot com
          Reporter: sam at gentoo dot org
  Target Milestone: ---

The gprofng seems to use `which` in a few places.

`which` isn't portable. Debian as well as other distros like Gentoo are trying
to remove it from their base system. See https://lwn.net/Articles/874049/.

For bash scripts, `type -P foo` is a good replacement. For POSIX shell scripts,
`command -v foo` is fine.

testsuite/lib/Makefile.skel has:
```
JAVABIN = $(shell dirname `which java`)
```

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