Separate test cases from examples

Also adds a runtests makefile target.

examples/Makefile

@@ -0,0 +1,17 @@
+CFLAGS ?= -g -O2 -Wall -D_GNU_SOURCE -L../src/
+
+all_targets += io_uring-test io_uring-cp
+
+all: $(all_targets)
+
+test_srcs := io_uring-test.c io_uring-cp.c
+
+test_objs := $(patsubst %.c,%.ol,$(test_srcs))
+
+io_uring-test: io_uring-test.c
+	$(CC) $(CFLAGS) -o $@ io_uring-test.c -luring
+io_uring-cp: io_uring-cp.c
+	$(CC) $(CFLAGS) -o $@ io_uring-cp.c -luring
+
+clean:
+	rm -f $(all_targets) $(test_objs)