'RELENG_3_0_0_RELEASE'.

This commit was manufactured to restore the state of the 3.0-RELEASE image.
Releases prior to 5.3-RELEASE are omitting the secure/ and crypto/ subdirs.

shared versions should not need to add -lm unless the program uses libm
itself.  Strictly speaking, libg++ depends on libstdc++, but libstdc++
has dynamic dependencies on some exception tables and binutils doesn't
seem to like it when a secondary library has undefined references.  It
doesn't seem to care when -lstdc++ is added on the command line to ld
though.  Anyway, the c++ driver adds -lstdc++ explicitly, so that should
be OK.  c++ also adds -lm explicitly too, even though it wouldn't need
to now. [except for statically linked binaries as .a files don't have an
equivalent of automatic internal shared object dependencies.]

Reviewed by:	bde

Don't merge this into -2.2 unless you understand the dependencies on
c++rt0, bsd.lib.mk, and gcc -shared.  I.e., let me do it.

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore.  This update would have been
insane otherwise.

testing I changed it to -c to check for missed files by looking at time
stamps in /usr/include/g++.

Submitted by: "Philippe Charnier" <charnier@xp11.frmug.org>

(it was directly underneath where bool.h used to be in the list, I think
 I must have not been paying attention and deleted a word from the wrong
 line.  The machine that I was testing on still had an (old?) osfcn.h file)

Pointed out by: Andreas Klemm <andreas@klemm.gtn.com>