lang/sbcl: Restore SBCL bootstrap and missing modules
There were several issues with the revamp of sbcl.
- The removal of the lisp contrib modules broke several ports dependent on them.
- The removal of a proper SBCL bootstrap (SBCL built by SBCL) broke DragonFly. Generally it is recommended that compilers build themselves, although it's unclear if SBCL has such a recommendation.
- Handling of .core suffix changed by default
This revamp was itself revamped signficantly:
A) Change SBCL option from building from locally installed SBCL to building
from a downloaded bootstrap SBCL compiler (supports FreeBSD i386 & amd64 and DragonFly x86_64)
B) Set this as the default option and move the formerly default CCL to a
C) Cosmetic: comment typo fixes, options realigned
D) contributed lisp modules readded to the makefile and pkg-plist
E) PLUS_BOOTSTRAPS switch to regenerate distinfo with all bootstrap files
F) Change "RENAME_DLM" PLIST_SUB to "CORE_SUFFIX" to unbreak makeplist
G) Regenerated pkg-plist (which wasn't previously ordered)
H) Set renaming of .core files to _core by default as it has been
previously done for years.
Approved by: DF Support / just-fix-it 
 No immediate response from ler@, adamw@, or maintainer after
notification of issues caused by changes of major update. Justified by
need to restore platform builds and dependent port builds.