lib/57607: external lib/Makefile needs build_install treatment

[campbell+netbsd%mumble.net@localhost]

>Number:         57607
>Category:       lib
>Synopsis:       external lib/Makefile needs build_install treatment
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Sep 06 13:20:00 +0000 2023
>Originator:     Taylor R Campbell
>Release:        current
>Organization:
The NetBSD Buildinstallation
>Environment:
>Description:
Like in https://gnats.netbsd.org/57461, the following library directories (found by searching for `.WAIT' in **/lib/Makefile) probably need the build_install treatment:

crypto/external/bsd/heimdal/lib
crypto/external/bsd/netpgp/lib
external/apache2/llvm/lib
external/bsd/atf/lib
external/bsd/elftoolchain/lib
external/bsd/libevent/lib
external/bsd/openldap/lib
external/cddl/osnet/lib
external/gpl3/gcc.old/lib
external/gpl3/gcc/lib
external/ibm-public/postfix/lib
external/mit/xorg/lib

Some of these may be false alarms, if they only install private libraries and reach over with LIBDPLIBS or PROGDPLIBS so they don't require dependall && install in their dependencies before dependall can run in them.
>How-To-Repeat:
incremental builds after shlib major bumps
>Fix:
Yes, please!