CFLAGS additions (w/o requiring Makefile changes).

[woobagooba]

The csmp-agent-lib Makefiles don’t provide an easy way (without modifying the Makefiles) to:
a. Add additional CFLAGS to the compilation
b. Add CFLAGS += -DOPENSSL and linking to OpenSSL
i. Maybe should be something like make OPENSSL_SUPPORTED=1 ?