handle SIGPIPE

Makefile

@@ -11,6 +11,7 @@ all:
 	make -C Tzum
 	make -C VRT
 	make bin/ISOWeek
+	make bin/flush
 	make bin/score
 	make bin/top20
 	make bin/week2files
@@ -18,6 +19,9 @@ all:
 bin/ISOWeek: cmd/ISOWeek/*.go
 	go build -o $@ $^
 
+bin/flush: cmd/flush/*.go
+	go build -o $@ $^
+
 bin/score: cmd/score/*.go
 	go build -o $@ $^