[CLISP] Remove code for GNU Common Lisp

We dropped support for it in SWIG 4.0.0 and nobody has stepped forward
to revive it in over 2 years.

See #2009.

Examples/test-suite/clisp/Makefile.in

@@ -1,51 +0,0 @@
-#######################################################################
-# Makefile for clisp test-suite
-#######################################################################
-
-LANGUAGE     = clisp
-CLISP        = @CLISPBIN@
-SCRIPTSUFFIX = _runme.lisp
-
-srcdir       = @srcdir@
-top_srcdir   = @top_srcdir@
-top_builddir = @top_builddir@
-
-include $(srcdir)/../common.mk
-
-# Overridden variables here
-# no C++ tests for now
-CPP_TEST_CASES =
-#C_TEST_CASES +=
-
-# Custom tests - tests with additional commandline options
-# none!
-
-# Rules for the different types of tests
-%.cpptest:
-	$(setup)
-	+$(swig_and_compile_cpp)
-	$(run_testcase)
-
-%.ctest:
-	$(setup)
-	+$(swig_and_compile_c)
-	$(run_testcase)
-
-%.multicpptest:
-	$(setup)
-	+$(swig_and_compile_multi_cpp)
-	$(run_testcase)
-
-# Runs the testcase. A testcase is only run if
-# a file is found which has _runme.lisp appended after the testcase name.
-run_testcase = \
-	if [ -f $(SCRIPTDIR)/$(SCRIPTPREFIX)$*$(SCRIPTSUFFIX) ]; then \
-	  env LD_LIBRARY_PATH=.:$$LD_LIBRARY_PATH $(RUNTOOL) $(CLISP) -batch -s $(SCRIPTDIR)/$(SCRIPTPREFIX)$*$(SCRIPTSUFFIX); \
-	fi
-
-# Clean: (does nothing, we dont generate extra clisp code)
-%.clean:
-	@exit 0
-
-clean:
-	$(MAKE) -f $(top_builddir)/$(EXAMPLES)/Makefile SRCDIR='$(SRCDIR)' clisp_clean