stris(1): fix bug only checking the first rune of strings

Makefile

@@ -28,7 +28,7 @@ RUSTLIBS = --extern getopt=build/o/libgetopt.rlib \
 CFLAGS += -I$(SYSEXITS)
 
 .PHONY: all
-all: dj false fop hru intcmp mm npc rpn scrut str strcmp swab true
+all: dj false fop hru intcmp mm npc rpn scrut strcmp stris swab true
 
 build:
 	# keep build/include until bindgen(1) has stdin support
@@ -118,10 +118,13 @@ scrut: build/bin/scrut
 build/bin/scrut: src/scrut.c build
 	$(CC) $(CFLAGS) -o $@ src/scrut.c
 
-.PHONY: str
+.PHONY: stris
-str: build/bin/str
+stris: build/bin/stris
-build/bin/str: src/str.c build
+build/bin/stris: src/stris.rs build build/o/libgetopt.rlib \
-	$(CC) $(CFLAGS) -o $@ src/str.c
+		build/o/libsysexits.rlib
+	$(RUSTC) $(RUSTFLAGS) --extern getopt=build/o/libgetopt.rlib \
+		--extern sysexits=build/o/libsysexits.rlib \
+		-o $@ src/stris.rs
 
 .PHONY: strcmp
 strcmp: build/bin/strcmp