Support Intel(R) SGX SDK 2.1.1

Change the way SGXSDK_INT_VERSION compared in Makefile.

This change will remove the "-ge" error from build log.

Linux crypto with Intel(R) SGX SDK 2.1 support

This version has all required modifications to support SGX SDK 2.1.

Linux crypto

Intel® SGX SSL Linux version. This version is intended to provide cryptographic services for Intel® Software Guard Extensions (SGX) enclave applications in Linux OS.