Reorganize native dep download and extraction (#154)

Summary:
This moves the native setup to a separate gradle file and unpacks everything outside the build folder. That way we don't throw everything away on every incremental build.

This is an intermediate step to get to a more declarative setup like Fresco has it and get rid of the individual hacks we have for every download.
Pull Request resolved: https://github.com/facebook/Sonar/pull/154

Reviewed By: jknoxville

Differential Revision: D8833812

Pulled By: passy

fbshipit-source-id: 2424c9d6e22e6092c04af344e06939b4a6aba041

android/third-party/overrides/LibEvent/CMakeLists.txt

@@ -0,0 +1,37 @@
+cmake_minimum_required (VERSION 3.6.0)
+
+PROJECT(libevent C)
+enable_language(C)
+set(PACKAGE_NAME      libevent)
+set(LIBEVENT_DIR  libevent-release-2.1.8-stable)
+list(APPEND DIR_LIST ${LIBEVENT_DIR}/)
+list(APPEND DIR_LIST ${LIBEVENT_DIR}/include)
+include_directories(${DIR_LIST})
+list(APPEND SRCFILES ${LIBEVENT_DIR}/event.c
+                     ${LIBEVENT_DIR}/buffer.c
+                     ${LIBEVENT_DIR}/bufferevent.c
+                     ${LIBEVENT_DIR}/bufferevent_filter.c
+                     ${LIBEVENT_DIR}/bufferevent_ratelim.c
+			 ${LIBEVENT_DIR}/bufferevent_sock.c
+                     ${LIBEVENT_DIR}/epoll.c
+			 ${LIBEVENT_DIR}/epoll_sub.c
+			 ${LIBEVENT_DIR}/evdns.c
+			 ${LIBEVENT_DIR}/event_tagging.c
+			 ${LIBEVENT_DIR}/evmap.c
+			 ${LIBEVENT_DIR}/evrpc.c
+			 ${LIBEVENT_DIR}/evthread.c
+			 ${LIBEVENT_DIR}/evthread_pthread.c
+			 ${LIBEVENT_DIR}/evutil.c
+			 ${LIBEVENT_DIR}/evutil_rand.c
+			 ${LIBEVENT_DIR}/http.c
+			 ${LIBEVENT_DIR}/listener.c
+			 ${LIBEVENT_DIR}/log.c
+			 ${LIBEVENT_DIR}/poll.c
+			 ${LIBEVENT_DIR}/select.c
+			 ${LIBEVENT_DIR}/signal.c
+			 ${LIBEVENT_DIR}/strlcpy.c
+)
+
+add_library(${PACKAGE_NAME} SHARED ${SRCFILES})
+install(TARGETS ${PACKAGE_NAME}  DESTINATION ./build/)
+target_link_libraries(${PACKAGE_NAME})