Public alternative to VFP_Push

[Guillaume Quintard]

Hi!

With 6.6, VFP_Push was made private, but it looks like there's no
alternative for it. I've seen VCL_StackVFP, but it's equally private.

For context, I'm currently using VFP_Push in
https://github.com/gquintard/vmod_reqwest/blob/4aecc793643d5eb395c43cbbad463c7b0deef6ab/src/lib.rs#L658
, pretty much exactly like Varnish does it internally:
- have a backend with a gethdrs method
- get called by VDI_GetHdr
- once the headers are in, use VFP_Push to inject a processor at the start
of the pipeline

It works very well, but if there's a way to respect the API boundaries, I'd
be happy to abide.

Cheers,

-- 
Guillaume Quintard
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