Move building of LIARC bundles into their respective directories.

Move building of LIARC bundles into their respective directories.
Create bundle file lists from .pkg files rather than from directory
listings.

Change "make c" to "make liarc-dist".  Restructure top-level makefile
to generate "liarc-dist" in distinct stages: (1) build a compiler in
the directory "boot-lib"; (2) run c-clean to discard all .c files; and
(3) rebuild everything using boot-lib compiler.

Delete "Makefile.std"; generate all subdirectory makefiles (except
microcode) using "Makefile-fragment" and standard prefix/suffix.
Rename COMPILE_FOR_DYNAMIC_LOADING to ENABLE_LIARC_FILE_INIT.  Don't
build 6001 or xdoc subdirs.  Use -fPIC only for shared objects, not
for scheme executable.  Make sure -fPIC is given to linker as well as
compiler.