found by the glibc testsuite

Fix various corner cases to pass the glibc test suite.

mmap() did not consider that a large page may be used to map an area that
it is overwriting.  This can happen if the primordial 1:1 area is remapped
(as when the payload is creating some guard pages).  The result is that
random memory is overwritten with a pte.

Fix by detecting large pages and splitting them up.

We need only to store the virtual address returned from malloc.
virt_to_phys is the function translating the virtual mem into physical.

In addition, I founf a design error in the virtio PFN code. It will only
affect us on > 44 bit ram..

* 'master' of github.com:cloudius-systems/osv:
  Moved some definitions to reside within the appropriate classes (vring_used, vring_avail)
  build: use headers and binaries from external/gcc.bin and external/glibc.bin
  Add glibc.bin submodule
  Add gcc binary submodule

Now the network driver has 3 queues as it should have

Required by pthread_getattr_np(), in turn required by the jvm.

* 'master' of github.com:/avikivity/osv:
  pthread: implement pthread_create()

queue size correctly.

Apparently glibc defines it as a macro, so it doesn't compile.  #undef it
back.

Caught by make mode=release.

Otherwise 'make' deletes the intermediate .o file and causes spurious
rebuilds.

Break long lines

Cuts boot time dramatically