CFLAGS were not being passed, breaking ASLR builds.

Switched to using PKG_SOURCE_DATE for the version.

Added PKG_BUILD_PARALLEL for faster compilation.

Added license information.

Small Makefile cleanups.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

crconf hasn't released any new version since 2012 or so.
And there are quite a few updates in the repo, including newer kernel
support.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

Linux crypto layer configuraton tool.
https://sourceforge.net/projects/crconf/

Use this to manipulate kernel Crypto API/framework stuff,
like drivers, templates, etc.
Example: https://wiki.strongswan.org/projects/strongswan/wiki/Pcrypt
Most interesting stuff you can find on https://wiki.strongswan.org

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>