Makefile: add ability to TAB-complete cocci *.patch rules

Declare the contrib/coccinelle/<rule>.cocci.patch rules in such a way
as to allow TAB-completion, and slightly optimize the Makefile by
cutting down on the number of $(wildcard) in favor of defining
"coccicheck" and "coccicheck-pending" in terms of the same
incrementally filtered list.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Taylor Blau <me@ttaylorr.com>

Makefile

@@ -3139,9 +3139,20 @@ check: $(GENERATED_H)
 		exit 1; \
 	fi
 
+COCCI_GLOB = $(wildcard contrib/coccinelle/*.cocci)
+COCCI_RULES = $(COCCI_GLOB)
+
+COCCICHECK_PENDING = $(filter %.pending.cocci,$(COCCI_RULES))
+COCCICHECK = $(filter-out $(COCCICHECK_PENDING),$(COCCI_RULES))
+
+COCCICHECK_PATCHES = $(COCCICHECK:%=%.patch)
+COCCICHECK_PATCHES_PENDING = $(COCCICHECK_PENDING:%=%.patch)
+
 COCCI_TEST_RES = $(wildcard contrib/coccinelle/tests/*.res)
 
-%.cocci.patch: %.cocci $(COCCI_SOURCES)
+COCCI_PATCHES = $(COCCI_RULES:%=%.patch)
+$(COCCI_PATCHES): $(COCCI_SOURCES)
+$(COCCI_PATCHES): %.patch: %
 	$(QUIET_SPATCH) \
 	if test $(SPATCH_BATCH_SIZE) = 0; then \
 		limit=; \
@@ -3178,11 +3189,11 @@ $(COCCI_TEST_RES_GEN): .build/contrib/coccinelle/tests/%.res : contrib/coccinell
 coccicheck-test: $(COCCI_TEST_RES_GEN)
 
 coccicheck: coccicheck-test
-coccicheck: $(addsuffix .patch,$(filter-out %.pending.cocci,$(wildcard contrib/coccinelle/*.cocci)))
+coccicheck: $(COCCICHECK_PATCHES)
 
 # See contrib/coccinelle/README
 coccicheck-pending: coccicheck-test
-coccicheck-pending: $(addsuffix .patch,$(wildcard contrib/coccinelle/*.pending.cocci))
+coccicheck-pending: $(COCCICHECK_PATCHES_PENDING)
 
 .PHONY: coccicheck coccicheck-pending