Added Sourcehut build for OpenBSD.
Added Sourcehut FreeBSD build.
Add Sourcehut build for Debian Linux.
Created initial project skeleton.

Added header and source files `lrnd.h` and `lrnd.c` respectively.
Filled them in with an initial definition of the `lrnd` struct and the
`lrnd_next_value()` function.  Also defined constant `lrnd_stdlib_rand`
generator that wraps the standard library `rand()` function.

Added initial test file `lrnd_tests.c` with a simple test.  Created an
Autotools build system.  Created a readme file and man page.  Added a
BSD-style license.