Don't mention "Unix" in native target name.

I find the mention of "Unix" unnecessary (and really slightly a lie)
on GNU/Linux in a couple of places:

 (gdb) maint print target-stack
 The current target stack is:
  - multi-thread (multi-threaded child process.)
  - child (Unix child process)
  - exec (Local exec file)
  - None (None)

 (gdb) help target child
 Unix child process (started by the "run" command).

 (gdb) target child
 Use the "run" command to start a Unix child process.

It's also odd that e.g., the Windows port says "Unix" in reaction to
"target child" (it was already that way before Windows used
inf-child.c):

 (gdb) target child
 Use the "run" command to start a Unix child process.
 (gdb)

So drop "Unix", going in the direction of saying mostly the same on
all native targets:

  (gdb) maint print target-stack
  The current target stack is:
   - multi-thread (multi-threaded child process.)
 - - child (Unix child process)
 + - child (Child process)
   - exec (Local exec file)
   - None (None)

  (gdb) help target child
 - Unix child process (started by the "run" command).
 + Child process (started by the "run" command).

 (gdb) target child
 -Use the "run" command to start a Unix child process.
 +Use the "run" command to start a child process.

gdb/
2014-03-13  Pedro Alves  <palves@redhat.com>

	* inf-child.c (inf_child_open, inf_child_target): Don't mention
	Unix in user visible strings.

gdb/testsuite/
2014-03-13  Pedro Alves  <palves@redhat.com>

	* gdb.base/default.exp: Update "target child" and "target procfs"
	tests to not expect "Unix".
Rename Solaris's target to "target child" like most other ports.

Note that "target procfs" is used by QNX, but the test must be failing
there, as nto-procfs.c overrides to_open with a method that doesn't
throw the error being tested.  So I'm just removing the test
completely.

gdb/
2014-03-13  Pedro Alves  <palves@redhat.com>

	* procfs.c (procfs_target): Don't override to_shortname,
	to_longname or to_doc.

gdb/testsuite/
2014-03-13  Pedro Alves  <palves@redhat.com>

	* gdb.base/default.exp: Don't test "target procfs".
Make the new aarch64 bignum test endian agnostic.

	* gas/aarch64/litpool.s: Make the test endian agnostic.
	* gas/aarch64/litpool.d: Update expected disassembly.