Pull up following revision(s) (requested by tsutsui in ticket #650):
distrib/hpcmips/miniroot/Makefile.inc: revision 1.20
distrib/hpcsh/miniroot/Makefile.inc: revision 1.8
distrib/hp300/miniroot/Makefile.inc: revision 1.13
distrib/hpcarm/miniroot/Makefile.inc: revision 1.7
distrib/vax/miniroot/Makefile.inc: revision 1.23
distrib/mvme68k/miniroot/Makefile.inc: revision 1.13
distrib/emips/miniroot/Makefile.inc: revision 1.3
distrib/pmax/miniroot/Makefile.inc: revision 1.24
Fix PR install/47123 (sysinst fails with "openpty() failed" on many ports):
Add "ipty" to MAKEDEVTARGETS in miniroot/Makefile.inc since "MAKEDEV all"
no longer creates /dev/pty* device nodes and miniroot doesn't mount ptyfs.