[jnc_app] add build rpath to OPENSSL_DLL_DIR
[jnc_app] add build rpath to OPENSSL_DLL_DIR

On Mac, we switched to using custom OpenSSL build (because system
unversioned OpenSSL dylibs are boobie-trapped on MacOS Catalina)

To pass tests, we need rpath to point to our custom openssl build (only
BUILD_RPATH, during installation everything is copied into the bundle)

vovkos/jancy,vovkos/jancy,vovkos/jancy,vovkos/jancy,vovkos/jancy