Update examples for Rust master

c-to-rust/Makefile

@@ -10,12 +10,11 @@ all: target/double
 target:
 	mkdir -p $@
 
-target/double: target/main.o target/libdouble_input.a
+target/double: target/main.o target/debug/libdouble_input.a
 	$(CC) -o $@ $^ $(LDFLAGS)
 
-target/libdouble_input.a: src/lib.rs Cargo.toml
+target/debug/libdouble_input.a: src/lib.rs Cargo.toml
 	cargo build
-	(cd target && ln -nsf debug/libdouble_input-*.a libdouble_input.a)
 
 target/main.o: src/main.c | target
 	$(CC) -o $@ -c $<