Everywhere: Remove everything non-essential for "make clean all"

This commit removes everything not strictly necessary for running
"make clean all" inside jw-build.

packaging jw-devtest. This cuts the repo down from 24077 to 4725
lines of code.

The idea is to

1) Further remove bloat from the remaining bits

2) Re-add what's necessary to build and package other essential repos.

   The decision should be based on whether or not jw-build can also be
   useful in a non-janware context.

Signed-off-by: Jan Lindemann <jan@janware.com>

make/py-run.mk

@@ -1,24 +0,0 @@
-include $(JWBDIR)/make/defs.mk
-include $(JWBDIR)/make/py-defs.mk
-#include $(JWBDIR)/make/scripts-targets.mk
-#include $(JWBDIR)/make/rules.mk
-
-EXE ?= $(firstword $(wildcard main.py runme.py test.py *.py))
-EXE_ARGS ?=
-
-all:
-install:
-clean:
-distclean:
-test:
-
-run:
-	$(PYTHON) $(EXE) $(EXE_ARGS)
-
-run.sh:
-	echo -e "#!/bin/bash\n\nexport PYTHONPATH=$(PYTHONPATH)\nset -x\nexec $(PYTHON) $(EXE)" '"$$@"' > $@.tmp
-	chmod 755 $@.tmp
-	mv $@.tmp $@
-clean-run-sh:
-	rm -f run.sh
-clean: clean-run-sh