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>

2011-02-28  Aurelien Jarno  <aurelien@aurel32.net>

	* sysdeps/unix/sysv/linux/alpha/bits/fcntl.h (F_SETPIPE_SZ,

	F_GETPIPE_SZ): Define.

diff --git glibc-2.13/glibc-ports-2.13/sysdeps/unix/sysv/linux/alpha/bits/fcntl.h glibc-2.13/glibc-ports-2.13/sysdeps/unix/sysv/linux/alpha/bits/fcntl.h

index 860e9ac..e5e726b 100644

--- glibc-2.13/glibc-ports-2.13/sysdeps/unix/sysv/linux/alpha/bits/fcntl.h

+++ glibc-2.13/glibc-ports-2.13/sysdeps/unix/sysv/linux/alpha/bits/fcntl.h

@@ -97,6 +97,8 @@

 # define F_SETLEASE	1024	/* Set a lease.	 */

 # define F_GETLEASE	1025	/* Enquire what lease is active.  */

 # define F_NOTIFY	1026	/* Request notfications on a directory.	 */

+# define F_SETPIPE_SZ	1031    /* Set pipe page size array.  */

+# define F_GETPIPE_SZ	1032    /* Set pipe page size array.  */

 #endif

 #ifdef __USE_XOPEN2K8

 # define F_DUPFD_CLOEXEC 1030	/* Duplicate file descriptor with