MDEV-12469 : Update AWS SDK version to avoid gcc7 compile errors.

plugin/aws_key_management/CMakeLists.txt

@@ -113,13 +113,10 @@ ELSE()
   ENDFOREACH()
 
   # To be compatible with older cmake, we use older version of the SDK
-  # We increase the version for macs however, so the newest mac could built it.
-  IF(APPLE)
-    SET(GIT_TAG "1.0.100")
-  ELSEIF(_OPENSSL_VERSION VERSION_EQUAL "1.1")
-    SET(GIT_TAG "1.0.114")
-  ELSE()
+  IF(CMAKE_VERSION LESS "3.0")
      SET(GIT_TAG "1.0.8")
+  ELSE()
+    SET(GIT_TAG "1.1.27")
   ENDIF()
 
   SET(AWS_SDK_PATCH_COMMAND )