suite_bench: add bench input skip/ignore/blacklist

some benchmark input files have different output from reference
implementation, ignore them for now in order to allow testing for
regressions for the currently passing inputs.

run ignored tests with

cargo test --features=suite_bench -- --ignored

tests/bench/Makefile

@@ -10,17 +10,19 @@ mod.rs: ${TEST_DJ} html
 	echo "use crate::suite_test;" > $@
 	for name in ${TEST}; do \
 		name_snake=$$(basename -a $$name | sed 's/-/_/g'); \
-		echo "#[test]" >> $@; \
-		echo "fn test_$$name_snake() {" >> $@; \
-		printf '    let src = r###"' >> $@; \
-		cat $$name.dj >> $@; \
-		echo '"###;' >> $@; \
-		printf '    let expected = r###"' >> $@; \
-		cat $$name.html >> $@; \
-		echo '"###;' >> $@; \
-		echo "    suite_test!(src, expected);" >> $@; \
-		echo "}" >> $@; \
-	done
+		skip_reason=$$(grep -E "^$${name_snake}:" skip | cut -d: -f2); \
+		[ -n "$$skip_reason" ] && echo "#[ignore = \"$${skip_reason}\"]"; \
+		echo "#[test]"; \
+		echo "fn $$name_snake() {"; \
+		printf '    let src = r###"'; \
+		cat $$name.dj; \
+		echo '"###;'; \
+		printf '    let expected = r###"'; \
+		cat $$name.html; \
+		echo '"###;'; \
+		echo "    suite_test!(src, expected);"; \
+		echo "}"; \
+	done >> $@
 
 html: djot-js ${TEST_DJ}
 	echo ${TEST}