esys_crypto_ossl.c: load engine explicitly
esys_crypto_ossl.c: load engine explicitly

In some cases, when built with the openssl crypto backend,
"ENGINE_by_id("openssl");" fails with the error that no engine named
"libopenssl.so" was found in the openssl "engines" directory. Loading the engine
explicitly with a call to "ENGINE_load_builtin_engines" eliminates this error.

Signed-off-by: Safayet Ahmed <c17450eaff7bc1df611d8e09b171bc8c3cb363eb@ge.com>

01org/TPM2.0-TSS,tpm2-software/tpm2-tss,tpm2-software/tpm2-tss,01org/tpm2-tss,tpm2-software/tpm2-tss,01org/tpm2-tss,01org/TPM2.0-TSS,01org/TPM2.0-TSS,01org/TPM2.0-TSS,01org/tpm2-tss