Add missing headers

Summary:
Add some missing headers required for
other oss projects.

These were not synced to the makefile.

Reviewed By: shixiao

Differential Revision: D9161271

fbshipit-source-id: 283042c35ac9f78fef24348e0d78b26ab8f2eeb8

folly/Makefile.am

@@ -118,6 +118,7 @@ nobase_follyinclude_HEADERS = \
 	executors/IOExecutor.h \
 	executors/IOObjectCache.h \
 	executors/IOThreadPoolExecutor.h \
+	executors/ManualExecutor.h \
 	executors/QueuedImmediateExecutor.h \
 	executors/ScheduledExecutor.h \
 	executors/SequencedExecutor.h \
@@ -299,6 +300,7 @@ nobase_follyinclude_HEADERS = \
 	io/async/VirtualEventBase.h \
 	io/async/WriteChainAsyncTransportWrapper.h \
 	io/async/test/AsyncSSLSocketTest.h \
+	io/async/test/AsyncSocketTest.h \
 	io/async/test/AsyncSocketTest2.h \
 	io/async/test/BlockingSocket.h \
 	io/async/test/MockAsyncSocket.h \