v0.94

Bump cloudlibc's version number to 0.94.

Changes:

- Added support for reading the process ID of processes from the
  runtime. The program_getuuid() function has been renamed to
  program_getpid().
- Properly deprecate all process descriptor related bits and move them
  into <program.h>.
- Rename uv_spawn() to program_spawn(), so that it doesn't clash with
  the official implementation of libuv.