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>

diff -durN gcc-4.4.0.orig/gcc/config/alpha/alpha.h gcc-4.4.0/gcc/config/alpha/alpha.h

--- gcc-4.4.0.orig/gcc/config/alpha/alpha.h	2009-02-20 16:20:38.000000000 +0100

+++ gcc-4.4.0/gcc/config/alpha/alpha.h	2009-05-27 21:37:58.000000000 +0200

@@ -95,6 +95,8 @@

   while (0)

 #endif

+#define CPP_SPEC "%{!no-ieee:-mieee}"

+

 #define WORD_SWITCH_TAKES_ARG(STR)		\

  (!strcmp (STR, "rpath") || DEFAULT_WORD_SWITCH_TAKES_ARG(STR))

diff -durN gcc-4.4.0.orig/gcc/config/alpha/alpha.opt gcc-4.4.0/gcc/config/alpha/alpha.opt

--- gcc-4.4.0.orig/gcc/config/alpha/alpha.opt	2007-08-02 12:49:31.000000000 +0200

+++ gcc-4.4.0/gcc/config/alpha/alpha.opt	2009-05-27 21:37:58.000000000 +0200

@@ -39,7 +39,7 @@

 Request IEEE-conformant math library routines (OSF/1)

 mieee

-Target Report RejectNegative Mask(IEEE)

+Target Report Mask(IEEE)

 Emit IEEE-conformant code, without inexact exceptions

 mieee-with-inexact