[Qemu-devel] build regression on osx in block layer

[Igor Mammedov]

Build fails with:

$ make    
  LINK  qemu-nbd
Undefined symbols for architecture x86_64:
  "_posix_fallocate", referenced from:
      _raw_create in raw-posix.o
ld: symbol(s) not found for architecture x86_64

introduced by
06247428be raw-posix: Add falloc and full preallocation