Build against vanilla OpenSSL 1.1.0h (#125)

Summary:
This uses OpenSSL 1.1.0h to build and link against. The `.so`s are
precompiled and hand-patched from [this
repository](https://github.com/passy/android-database-sqlcipher). The
patching was necessary to fix the `SONAME` and corresponding `NEEDED`
flags to *not* contain a `.1.1` version suffix as Gradle will refuse to
bundle those.

We basically only use the headers for the remaining part.

The precompiled version contains ABI support for `arm64-v8a`, `armeabi`,
`armeabi-v7a`, `x86` and most importantly `x86_64`. HOWEVER, `x86_64` is
still excluded for now because folly fails to compile due to a missing
compiler flag:

```
error: needs target feature pclmul
```

This should be easily fixable by ensuring that `-mpclmul` is added to
the CFLAGS if we're compiling for an `x86_64` target in the
`CMakeLists.txt` for Folly.

Closes #113.
Closes https://github.com/facebook/Sonar/pull/125

Reviewed By: priteshrnandgaonkar

Differential Revision: D8723636

Pulled By: passy

fbshipit-source-id: 41c61047d2793ebaef5793a3c937c4d628471d6a

xplat/CMakeLists.txt

@@ -13,7 +13,7 @@ set(glog_DIR ${third_party_ndk}/glog)
 set(BOOST_DIR ${third_party_ndk}/boost/boost_1_63_0/)
 set(LIBEVENT_DIR ${third_party_ndk}/LibEvent/libevent-release-2.1.9/)
 set(DOUBLECONVERSION_DIR ${third_party_ndk}/double-conversion/double-conversion-3.0.0/)
-set(OPENSSL_DIR ${third_party_ndk}/OpenSSL/openssl-android-1.0.0/)
+set(OPENSSL_DIR ${third_party_ndk}/OpenSSL/openssl-1.1.0h/)
 
 list(APPEND dir_list ./)
 list(APPEND dir_list ./Sonar)
@@ -61,9 +61,7 @@ target_include_directories(${PACKAGE_NAME} PRIVATE
         ${rsocket_DIR}/rsocket-cpp-0.10.1
         ${LIBEVENT_DIR}/include/
         ${LIBEVENT_DIR}/include/event2
-        ${OPENSSL_DIR}/jni/openssl-android/
-        ${OPENSSL_DIR}/jni/openssl-android/include
-        ${OPENSSL_DIR}/jni/openssl-android/include/openssl
+        ${OPENSSL_DIR}/include
         ${glog_DIR}
         ${glog_DIR}/../
         ${glog_DIR}/glog-0.3.5/src/