[Libguestfs] [PATCH nbdkit v2 0/2] build: Replace ./nbdkit with a C program.

v1 was here: https://www.redhat.com/archives/libguestfs/2018-November/msg00147.html v2: - Use stdbool for booleans. - Use __attribute__((format(printf))). - Don't abort on invalid options, exit with failure instead. - Preserve long/short option choices in the output. - Add '=' in long option output, ie. always use --longopt=arg. - Add "--" parameter (unconditionally) before non-options. - Fix comments that referred to "alphanumeric" plugin and filter names. - Retested. Rich.