[Libguestfs] [PATCH nbdkit v3 0/4] build: Replace ./nbdkit with a C program.

[Richard W.M. Jones]

v1 was here:
https://www.redhat.com/archives/libguestfs/2018-November/msg00147.html

v2 was here:
https://www.redhat.com/archives/libguestfs/2018-November/msg00152.html

v3:

 - Use optarg != NULL as a sentinel for has_arg.

 - Moved some variable decls into the inner loop.

 - Make nbdkit wrapper depend on config.status, so if srcdir or
   builddir changes then we rebuild the wrapper.  It probably does so
   anyway because <config.h> will change, but let's be safe.

 - Document NBDKIT_VALGRIND=1 and NBDKIT_GDB=1.

 - Add two extra patches which fix existing uses of NBDKIT_VALGRIND.

 - Retested (make check && make check-valgrind).

Rich.