Move more release code from Makefile to CL.
Fix shell-tokens-to-Makefile on CLISP (CLISP bug in loop, or my misreading the spec?)
Fix some tests, make them more verbose.
Driver: Fix native-namestring on SCL; fix issues on CLISP:
Setting the *source-file-types* and *compiled-file-types* to nil
was preventing (require "linux") from working(!).

Fix list-files and export it to the command-line.
Fix version extraction in bootstrapped build.
Update documentation: document :executable. Remove ASDF1 crud.

Extract version from git when finalizing the image (requires cl-launch 3.009).
On CCL/windows, work around bug ccl bug 858 in run-program.
Simplify some tests for run-program, fix others.

Extract version from git when finalizing the image (requires cl-launch 3.009).
On CCL/windows, work around bug ccl bug 858 in run-program.
Simplify some tests for run-program, fix others.

Try to make it work with gcl - but gcl fails to compile driver.lisp.

	settings known to xcvb or the individual value of a single one.
Change the default object-directory location to be
	$HOME/.cache/xcvb/common-lisp/<lisp-implementation-version>/
Added format! in driver.lisp to help with debugging and forcing output.
Debugged CMUCL support in driver.
Fixed implementation-identifier support in extract-target-properties.
Allowed Makefile in example-1 to parameterize on lisp implementation.
Refactored how option-specs are specified for command line options.
Removed dead code paths from simple-build backend that dealt with
	"xcvb.mk" and the makefile output file.
Muffled warnings when loading asdf.
Added target-asdf-version setting which you can query with show-settings.
Started DONE.rest

Very portable, but serial support only, no parallel queueing for now.
Also, driver.lisp now has *fatal-conditions* like *uninteresting-conditions*
instead of *fatal-condition*.
Added support for driving all the current actively maintained CL implementations.

Unrot release and test scripts.
Tested: XCCL=stccl make test LISP=ccl

Passes a "make test"

One key was to use
 (define-compiled-dependency :build (x) `(:build ,x))
instead of `(:compile-build ,x)
because e.g. asdf, cl-ppcre, etc., are often being fully used at compile-time
not just compiled against for use at run-time.

Notably fixed a typo in removing feature*s*, as noticed by Theam Yong Chew. Thanks!

Also, fix ssr with require supersession and fix xcvb-farmer conditionals.

Conditionalize away the xcvb farmer to not depend on iolib.

We were using CCL's run-program, that spawned a thread that reset the
pthread_sigmask. Evil. We now use a run-program/process-output-stream
based on iolib and short-circuit the implementation's. Sigh.

transient threads created by posix_spawn. Sigh.

Also, supersede some sbcl contrib asdf systems with appropriate requires.

Fix variable names in farmer.
Tweak Makefile to avoid unnecessary work.