When our linker merges .SUNW_dof sections from multiple files, it simply
concatenates the DOF tables into one section. Previously, the USDT init
code in drti.o would only look at the first table in the DOF section; with
this change, it iterates over all the tables, passing each DOF table to
the kernel.

PR:		186821
Submitted by:	Fedor Indutny <fedor@indutny.com>
MFC after:	1 month
Use ${MAKE} so that we always use the same version/implementation
of make.
Revive support for /etc/issue, lost due revision 81963.

Obtained from:	Juniper Networks, Inc.