Include AsyncSocketTest.h to list of exported test headers

Summary: Adds header to the test headers exported by folly

Reviewed By: yfeldblum

Differential Revision: D8524926

fbshipit-source-id: 06983789c3ee9e403211fb5335365663878c2590

CMakeLists.txt

@@ -132,6 +132,7 @@ list(APPEND files
 )
 list(APPEND hfiles
   ${FOLLY_DIR}/io/async/test/AsyncSSLSocketTest.h
+  ${FOLLY_DIR}/io/async/test/AsyncSocketTest.h
   ${FOLLY_DIR}/io/async/test/AsyncSocketTest2.h
   ${FOLLY_DIR}/io/async/test/BlockingSocket.h
   ${FOLLY_DIR}/io/async/test/MockAsyncSocket.h