panic: declare as printf-style-checked

	. and related fixes

Change-Id: I5131ac57dc53d8aec8d421a34c5ceea383404d7a
Importing usr.bin/logname
fix inet warnings

Change-Id: Ia6e761d2c649f03a49b2646387f859d6c2a646cb
vfs: mmap support

	. libc: add vfs_mmap, a way for vfs to initiate mmap()s.
	  This is a good special case to have as vfs is a slightly
	  different client from regular user processes. It doesn't do it
	  for itself, and has the dev & inode info already so the callback
	  to VFS for the lookup isn't necessary. So it has different info
	  to have to give to VM.
	. libc: also add minix_mmap64() that accepts a 64-bit offset, even
	  though our off_t is still 32 bit now.
	. On exec() time, try to mmap() in the executable if available.
	  (It is not yet available in this commit.)
	. To support mmap(), add do_vm_call that allows VM to lookup
	  (to ino+dev), do i/o from and close FD's on behalf of other
	  processes.

Change-Id: I831551e45a6781c74313c450eb9c967a68505932
pfs, vfs: increase various limits

	. pipes in pfs
	. vnodes in vfs
	. thread stack sizes in vfs

Change-Id: Ib27dedd42f57a90821a5b950cd7ea25cb2b42f3f
vm: mmap support

	. test74 for mmap functionality
	. vm: add a mem_file memory type that specifies an mmap()ped
	  memory range, backed by a file
	. add fdref, an object that keeps track of FD references within
	  VM per process and so knows how to de-duplicate the use of FD's
	  by various mmap()ped ranges; there can be many more than there can
	  be FD's
	. turned off for now, enable with 'filemap=1' as boot option

Change-Id: I640b1126cdaa522a0560301cf6732b7661555672
ld.elf_so, grep, make: use mmap()

	. let the dynamic linker use a real file mmap(), reverting
	  most of the minix-specific changes
	. except for a fallback mode for systems or filesystems that
	  do not support mmap() on files
	. make, grep: let them use mmap() too, with fallback

Change-Id: I11c0c9ad439d713917a6f5c2d196558f6c03eabd
vm: handle disappearing process case

Change-Id: Id96759883e4cdb175c79dcef7ef5ff254612101f