kernel/linux: fix using custom location

Currently, extract and patch are skipped as thus:
- using a custom directory of pre-installed headers
- a correctly named directory already exists

Otherwise, extract and patch are done.

The current second condition is wrong, because it allows the following
sequence to happen:
- a non-custom kernel is used
- a previous build only partially extracted the non-custom sources
- that p[revious build broke during extraction (eg. incomplete tarball...)
- a subsequent build will find a properly named directory, and will
thus skip extract and patch, which is wrong

Fix that by following the conditions in this table:

Type | Extract | Patch
----------------------+---------+-------
Pre-installed headers | N | N
custom directory | N | N
custom tarball | Y | N
mainstream tarball | Y | Y

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: David Holsgrove <david.holsgrove@xilinx.com>

 The m68k mcpu processor does not like unaligned access

 Disable at least mcpu32, m68010 and m68020. These processors certainly

 do not like unaligned accesses.

 Signed-off-by: Remy Bohmer <linux@bohmer.net>

 ---

  newlib/libc/machine/m68k/memcpy.S |    2 +-

  1 file changed, 1 insertion(+), 1 deletion(-)

 Index: newlib-1.18.0/newlib/libc/machine/m68k/memcpy.S

 ===================================================================

 --- newlib-1.18.0.orig/newlib/libc/machine/m68k/memcpy.S

 +++ newlib-1.18.0/newlib/libc/machine/m68k/memcpy.S

 @@ -15,7 +15,7 @@

  #include "m68kasm.h"

 -#if defined (__mcoldfire__) || defined (__mcpu32__) || defined (__mc68010__) || defined (__mc68020__) || defined (__mc68030__) || defined (__mc68040__) || defined (__mc68060__)

 +#if defined (__mcoldfire__) || defined (__mc68030__) || defined (__mc68040__) || defined (__mc68060__)

  # define MISALIGNED_OK 1

  #else

  # define MISALIGNED_OK 0