- add cmake build options as configure provides
* -DENABLE_ASM (default ON)
* -DENABLE_EXTRATESTS (default OFF)
* -DENABLE_NC (default OFF)
* -DOPENSSLDIR (default ${CMAKE_INSTALL_PREFIX}/etc/ssl)
- add biotest and pidwraptest if ENABLE_EXTRATESTS is ON
- add compiler flag `-fno-common` if CMAKE_SYSTEM_NAME is Darwin
to prevent link error Undefined symbols "_OPENSSL_ia32cap_P"
This moves the compatibility include files from include to
include/compat so we can use the awful MS C compiler
<../include/> trick to emulate the GNU #include_next extension.
This also removes a few old compat files we do not need anymore.