bsd.mkopt.mk: Prepare a list of all build optionsHEADmain

After processing all the build options, iterate over the complete list
minus CLEAN, MAN and TESTS, and prepare two variables:

* SRC_OPT_DEFS is a list of -D and -U directives, suitable for passing
  to cpp or unifdef, where each option is either defined or undefined
  depending on whether it is set or unset.  This list also includes
  -D__${MACHINE_ARCH}__.

* SRC_OPT_LIST is a list of build options suitable for passing to make
  itself (or sticking in /etc/src.conf).  This list also includes
  TARGET=${MACHINE} and TARGET_ARCH=${MACHINE_ARCH}.

Note that this list is cumulative, so it includes both options defined
in bsd.opts.mk and options defined in src.opts.mk.

Reviewed by:	kevans
Differential Revision:	https://reviews.freebsd.org/D51827

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