because the messages in the reference version were horrible.

Also don't rely on protocol numbers, they vary per platform.

having bereq.body hardcoded in the compiler is not nice.

Previously, we would get PROXY vxids without a Proxy line like:

    262253 Begin          c sess 0 PROXY
    262253 SessOpen       c w.x.y.z 1234 a0 a.b.c.d 85 1516787007.682753 32
    262253 Link           c req 262254 rxreq

Otherwise we might end up missing the signal and fail later when
reset the process.  All tests are passing in OSX now.

Merges #2545

I got this wrong in 69695c23 for the
case that the segment spans two pages.

Ref: #2541

mmaps from b25.vtc varnishstat:

before this change:

6598  open("/tmp/vtc.6492.2b3b5875/v1//_.vsm_child/_.VSC_cluster.322833fd50de0860", O_RDONLY) = 21
6598  mmap(NULL, 4096, PROT_READ, MAP_SHARED, 21, 0) = 0x7fb92529e000
...
6598  open("/tmp/vtc.6492.2b3b5875/v1//_.vsm_child/_.VSC_cluster.322833fd50de0860", O_RDONLY) = 21
6598  mmap(NULL, 8192, PROT_READ, MAP_SHARED, 21, 0) = 0x7fb925271000
...
6598  open("/tmp/vtc.6492.2b3b5875/v1//_.vsm_child/_.VSC_cluster.322833fd50de0860", O_RDONLY) = 21
6598  mmap(NULL, 12288, PROT_READ, MAP_SHARED, 21, 0x1000) = 0x7fb925222000
...
6598  open("/tmp/vtc.6492.2b3b5875/v1//_.vsm_child/_.VSC_cluster.322833fd50de0860", O_RDONLY) = 21
6598  mmap(NULL, 12288, PROT_READ, MAP_SHARED, 21, 0x2000) = 0x7fb92521f000

after this change:

7749  open("/tmp/vtc.7648.2c3869d9/v1//_.vsm_child/_.VSC_cluster.09720dc34dd3559c", O_RDONLY) = 21
7749  mmap(NULL, 4096, PROT_READ, MAP_SHARED, 21, 0) = 0x7f0938a28000
...
7749  open("/tmp/vtc.7648.2c3869d9/v1//_.vsm_child/_.VSC_cluster.09720dc34dd3559c", O_RDONLY) = 21
7749  mmap(NULL, 4096, PROT_READ, MAP_SHARED, 21, 0x1000) = 0x7f09389f9000
...
7749  open("/tmp/vtc.7648.2c3869d9/v1//_.vsm_child/_.VSC_cluster.09720dc34dd3559c", O_RDONLY) = 21
7749  mmap(NULL, 8192, PROT_READ, MAP_SHARED, 21, 0x1000) = 0x7f09389d2000
...
7749  open("/tmp/vtc.7648.2c3869d9/v1//_.vsm_child/_.VSC_cluster.09720dc34dd3559c", O_RDONLY) = 21
7749  mmap(NULL, 4096, PROT_READ, MAP_SHARED, 21, 0x2000) = 0x7f09389d1000

Notice that we keep the mappings at one or two pages now and do not increase
the length with the offset.

Fixes #2546

This commit partially reverts and reworks b9f7170b. We now do the "wait
for active streams" handling via the loop in h2_new_session, to ensure
the workspace is in a predictable state once HTC_RxStuff is called
again.

Fixes: #2539

No need to waste more precious human life time with stupid editing

so tell make in lib/libvcc how to invoke it.

Exposed by 062234c1: Now code changes
(as when switching branches) may require a rebuild in lib/libvcc only