fix cmake rule for AsyncIOTest

Summary: Make AsyncIOTest.cpp conditionally depend on $LIBAIO_FOUND in CMakeLists.txt.

Reviewed By: yfeldblum

Differential Revision: D14365682

fbshipit-source-id: 5ac7dc25174ab48ed1de8846956e69c7759fc9bd

CMakeLists.txt

@@ -502,8 +502,6 @@ if (BUILD_TESTS)
       TEST tuple_ops_test SOURCES TupleOpsTest.cpp
 
     DIRECTORY experimental/io/test/
-      # Depends on libaio
-      #TEST async_io_test SOURCES AsyncIOTest.cpp
       TEST fs_util_test SOURCES FsUtilTest.cpp
 
     DIRECTORY external/farmhash/test/
@@ -816,6 +814,13 @@ if (BUILD_TESTS)
     )
   endif()
 
+  if (${LIBAIO_FOUND})
+    folly_define_tests(
+      DIRECTORY experimental/io/test/
+        TEST async_io_test SOURCES AsyncIOTest.cpp
+    )
+  endif()
+
   get_target_property(pic folly POSITION_INDEPENDENT_CODE)
   if (pic)
     add_library(singleton_thread_local_overload