packages: Improve handling of -lib packages

For some packages (OpenSSL, Kerberos) we want to ship runtime libraries
in a separate package, e.g. openssl and openssl-lib.  Currently this is
done using PACKAGE=openssl-lib, but that creates packages with strange
names like openssl-lib-lib32.

Instead, add a new LIB_PACKAGE option to bsd.lib.mk that causes runtime
libraries to be placed in a new -lib subpackage.  This significantly
improves the set of packages we create; for example, OpenSSL goes from:

	FreeBSD-openssl
	FreeBSD-openssl-dbg
	FreeBSD-openssl-lib
	FreeBSD-openssl-lib-dbg
	FreeBSD-openssl-lib-dbg-lib32
	FreeBSD-openssl-lib-dev
	FreeBSD-openssl-lib-dev-lib32
	FreeBSD-openssl-lib-lib32
	FreeBSD-openssl-lib-man
	FreeBSD-openssl-man

to:

	FreeBSD-openssl
	FreeBSD-openssl-dbg
	FreeBSD-openssl-dbg-lib32
	FreeBSD-openssl-dev
	FreeBSD-openssl-dev-lib32
	FreeBSD-openssl-lib
	FreeBSD-openssl-lib32
	FreeBSD-openssl-man

While here, move /usr/bin/krb5-config and /usr/bin/compile_et into
the kerberos-dev package.

Reviewed by:	des
Differential Revision:	https://reviews.freebsd.org/D51925

lib/libcrypt/Makefile

@@ -45,7 +45,7 @@ libcrypt.ald: ${.CURDIR}/${STATIC_LDSCRIPT}
 all: ${STATIC_LDSCRIPT} libcrypt.ald
 
 install-libcrypt.a: libcrypt.ald
-	${INSTALL} ${TAG_ARGS:D${TAG_ARGS},dev} -S -C -o ${LIBOWN} -g ${LIBGRP} -m ${LIBMODE} \
+	${INSTALL} ${DEV_TAG_ARGS} -S -C -o ${LIBOWN} -g ${LIBGRP} -m ${LIBMODE} \
 	    ${_INSTALLFLAGS} libcrypt.ald ${DESTDIR}${_LIBDIR}/lib${LIB}.a
 
 realinstall: install-libcrypt.a