Changes 1.3.0
 * Add ChaCha20 DRNG self test
 * Bug fix drng_chacha20_alloc: if mlock fails, deallocate memory
 * Update Jitter RNG to version 2.1.0
 * Support multiple noise sources concurrently

Changes 1.2.2
 * Minor changes to compile on embedded systems (thanks to Jason Cooper)

Changes 1.2.1
 * make implementation of chacha20_update faster by using one loop
 * initialize the ChaCha20 key state with a time stamp
 * catch return code of mlock
 * enhance tests

Changes 1.2.0
 * place version macros into the C so that they are private (thanks to Jason Cooper)
 * add license files (thanks to Jason Cooper)
 * change drng_chacha20_versionstring to return the snprintf error (thanks to Jason Cooper)

Changes 1.1.0
 * fix invocation of getrandom syscall
 * remove debug printf
 * use private name space for version macros
 * add API calls to obtain version of implementation

Changes 1.0.0
 * Initial version
