increase the runtime a bit

parallel/coins/Makefile

 TOP = ../..
 include $(TOP)/mk/boilerplate.mk
 
-SRC_RUNTEST_OPTS += 3 863
+# This version just counts the results, and runs in constant space:
+# SRC_RUNTEST_OPTS += 7 1163
+
+# This version builds a list of the results, and needs a lot of memory:
+SRC_RUNTEST_OPTS += 3 873
+
 SRC_HC_OPTS += -package parallel
 
 include $(TOP)/mk/target.mk