[Bug 282909] make(1): delays and error spamming when run from a dir which is automounted using -hosts

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282909

            Bug ID: 282909
           Summary: make(1): delays and error spamming when run from a dir
                    which is automounted using -hosts
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: mail@fbsd2.e4m.org

If we run make(1) without the env var MAKESYSPATH being set and from a
directory which is automounted using the special map "-hosts" in an environment
where no NFS server named "share" exists, operation is slowed down
significantly and the syslog is spammed with messages like:

Nov 22 09:01:54 <daemon.warn> kiste automountd[12840]:
"/etc/autofs/special_hosts share", pid 12841, terminated with exit status 1

Nov 22 09:01:54 <kern.crit> kiste kernel: [2773] WARNING: autofs_trigger_one:
request for /net/ completed with error 5, pid 12839 (make)

Nov 22 09:01:54 <daemon.crit> kist automountd[12840]: failed to handle special
map "-hosts"

This is because make(1) uses the compile-time defined DEFAULT_SYS_PATH
(.../share/mk:/usr/share/mk) and goes up the path until it hits "/net/share".

How to reproduce:

1. Set up an automount environment using

/net    -hosts  (optional options)

2. cd to an (existing) dir, e.g.

cd /net/myserver/some_dir

3. Type "make" (no Makefile needed).

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