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

Erstelle den Android-arm64-v8a-Build mit den aufgeführten CMake-Argumenten erneut und überprüfe anschließend make install sowie die Abhängigkeitspfade unter external/curl/lib, external/openssl/lib und external/zlib/lib. Prüfe, ob das installierte SDK auf einem anderen Rechner ohne das Build-Verzeichnis gelinkt werden kann; abgeschlossen ist die Aufgabe, wenn die erforderlichen Abhängigkeiten curl, OpenSSL und zlib korrekt installiert oder referenziert sind.

Vom Indexierungsmodell aus dem Issue-Text verfasst.