fix: remove lint-related codes

[SAutum]

fix: remove lint-related codes

Proposed changes: Remove the lint-related codes which are no longer in use.

[cburstedde]

Thanks!
If I run grep -r LINT . 2>/dev/null | grep -v Makefile\.in | egrep -v '^./(sc|.git)'
I get a couple more matches:

./configure.ac:dnl SC_PROG_LINT
./Makefile.am:LINT_CSOURCES =
./Makefile.am:## ALL_LINT_FLAGS = $(LINT_FLAGS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
./Makefile.am:## if LINT
./Makefile.am:## 	for f in $(LINT_CSOURCES) ; do \
./Makefile.am:## 		$(LINT) $(ALL_LINT_FLAGS) $(top_srcdir)/$$f || \
./src/Makefile.am:LINT_CSOURCES += $(libp4est_compiled_sources)
./src/p4est_base.c:#ifndef SC_SPLINT
./test/Makefile.am:LINT_CSOURCES += \
./test/Makefile.am:LINT_CSOURCES += \

The related code can be removed entirely.

[cburstedde]

Thanks!