Cross compiled OpenSSL and Curl android dependencies are not "installed"

### What platform/OS are you using?
OSX 10.13.6 (and Ubuntu 16.04)
### What compiler are you using? what version?
Clang 6.0.2 via Android NDK r17c
(with some modifications to pass the right args & guess the version correctly)
### What's your CMake arguments?

export BUILD_ABI=arm64-v8a
export EXTRA_AWS_OPTIONS=" -DTARGET_ARCH=ANDROID -DANDROID_ABI=$BUILD_ABI "
cmake \
-DCMAKE_INSTALL_PREFIX=$INSTALL_DIR \
-DCMAKE_RULE_MESSAGES:BOOL=OFF \
-DCMAKE_VERBOSE_MAKEFILE:BOOL=ON \
-DBUILD_SHARED_LIBS:BOOL=OFF \
-DFORCE_SHARED_CRT:BOOL=OFF \
$EXTRA_AWS_OPTIONS \
-DBUILD_ONLY='logs;core;iam;access-management;identity-management;cognito-identity;cognito-idp;s3;kinesis;sts' \
$PROJECTHOME/aws-sdk-cpp "

### Can you provide a TRACE level log? (sanitize any sensitive information)

After taring up the install directory, when moving to another machine linking against the installed files fails with:

/opt/work/test/../aws-sdk-cpp/lib/libaws-cpp-sdk-core.a(CryptoImpl.cpp.o): In function `Aws::Utils::Crypto::OpenSSL::init_static_state()':
CryptoImpl.cpp:(.text._ZN3Aws5Utils6Crypto7OpenSSL17init_static_stateEv+0xc): undefined reference to `ERR_load_CRYPTO_strings'
CryptoImpl.cpp:(.text._ZN3Aws5Utils6Crypto7OpenSSL17init_static_stateEv+0x10): undefined reference to `OPENSSL_add_all_algorithms_noconf'

And a bunch more, and some curl references.

The root cause appears to be that the libcurl.a and libssl.a live in the build directory and make install doesn't put the dependencies where aws can find them.

It would be nice if make install could install the special built components required (they exist in the build directory, but would prefer not to archive that.)
aws-sdk-cpp/external/curl/lib/libcurl.a
aws-sdk-cpp/external/openssl/lib/libssl.a
aws-sdk-cpp/external/openssl/lib/libcrypto.a
aws-sdk-cpp/external/zlib/lib/libz.a

記載された CMake 引数で Android arm64-v8a ビルドを再現し、その後 make install と external/curl/lib、external/openssl/lib、external/zlib/lib 配下の依存関係パスを確認します。ビルドディレクトリなしで、インストールされた SDK を別のマシン上でリンクできるか確認します。必要な curl、OpenSSL、zlib の依存関係が正しくインストールまたは参照されていれば完了です。

索引モデルが issue の本文から書いたものです。