[PATCH 1/2] t/io_uring: link with libaio when necessary

When CONFIG_LIBAIO is enabled, we need t/io_uring to link with it.
(libaio_LIBS only affects the aio engine, AFAICT.)

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---

diff --git a/Makefile b/Makefile
index 5d17bca..00e7953 100644
--- a/Makefile
+++ b/Makefile
@@ -99,6 +99,7 @@ endif
 ifdef CONFIG_LIBAIO
   libaio_SRCS = engines/libaio.c
   cmdprio_SRCS = engines/cmdprio.c
+  LIBS += -laio
   libaio_LIBS = -laio
   ENGINES += libaio
 endif