Remove lint-specific code

Remove lint-specific code

Note: cppcheck and CSA replace lint tool.

* Makefile.direct (lint): Remove.
* dyn_load.c [SOLARISDL && !USE_PROC_FOR_LIBRARIES && LINT] (_DYNAMIC):
Remove.
* dyn_load.c [IRIX5 || (USE_PROC_FOR_LIBRARIES && !LINUX)]
(GC_register_dynamic_libraries): Remove comment about a false warning
reported by lint.
* mach_dep.c [ASM_CLEAR_CODE && LINT] (GC_clear_stack_inner): Remove.
* tests/test.c (typed_test): Call GC_make_descriptor unconditionally.
* tests/test.c (run_one_test): Set y to fail_proc1 unconditionally.
* tests/test.c (main): Do not check whether LINT is defined.