This is similar to `varnishd -x optstring`.

Refs dc5fe3b

This helps write scripts like this:

    optstring=$(varnishd -x optstring)

    while getopts $optstring opt
    do
        case $opt in
        n)
            # handle $OPTARG
            ;;
        # handle other options
        *)
            # ignore unneeded options
            ;;
        esac
    done

    varnishd "$@"

Otherwise if optstring is not kept in sync, getopts will stop processing
options if it encounters one that is not specified.

Originally we decided that the output of VCC should be 100%
stand-alone and therefore contain no #includes at all.  This
was hoped to avoid unspecified trouble with C-compilers at runtime.

But C99 is old enough to drink now, so we move forward.

The script in tools/include_wash.py checks *.c files and
complains about violations of our intended #include orders.

Getting the quoting right to pass along the empty string in SunOS
is not working.

The code path is tested in vsl_glob_test.

fnmatch(3) appears to know FNM_IGNORECASE but not FNM_CASEFOLD.

Don't include vrt.h after cache_varnishd.h, which includes cache.h.

The extra locking prevents the race where a request thread is setting
r2->cond = NULL and the session thread is testing r2->cond != NULL.

Fixes: #2434

Keeping these in struct sess would necessitate extra locking for h/2
where we have multiple reqs in flight concurrently.

Fixes: #2268

This moves the body status decision to h2_end_headers, to make sure that
it is only done once per request.

We also move the Cookie header concatenation to h2_end_headers, to avoid
stepping on any changes that may have taken place in VCL.

Fixes: #2305

This is part of the $ABI reorg.

Two static checkers and myself had problems understanding the old code.

Avoid an undefined behavior of memcpy() in _tr_stored_block().

Allegedly the behavior of memcpy() is undefined if the source
pointer is NULL, even if the number of bytes to copy is zero.