cc/gcc: disable complibs if not selected

Force gcc to not link with some companion libraries when
there are not needed (because selected-out).

There is no option to tell gcc *not* to build the Graphite and/or
LTO stuff. They *will* be built if gcc finds the suitable companion
libraries. If we do not provide them, but the host has them, then
gcc *will* find them, and link with them.

Consider the following:
- host has suitable PPL and CLooG (eg. Debian Squeeze)
- user wants to build gcc>=4.4
- user de-selects GRAPHITE
- gcc will find the hosts PPL and CLooG, and will use them
- the user moves the toolchain to an older host that does
not have them (eg. Debian Lenny)
- the toolchain fails, when it was properly setup not to

So, explicitly tell gcc *not* to use unneeded companion libs.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

diff -durN glibc-2.7.orig/sysdeps/unix/sysv/linux/sh/sys/procfs.h glibc-2.7/sysdeps/unix/sysv/linux/sh/sys/procfs.h

--- glibc-2.7.orig/sysdeps/unix/sysv/linux/sh/sys/procfs.h	2008-10-22 21:23:32.000000000 +0200

+++ glibc-2.7/sysdeps/unix/sysv/linux/sh/sys/procfs.h	2008-10-22 21:41:54.000000000 +0200

@@ -29,6 +29,7 @@

 #include <sys/types.h>

 #include <sys/ucontext.h>

 #include <sys/user.h>

+#include <asm/ptrace.h>

 __BEGIN_DECLS

diff -durN glibc-2.7.orig/sysdeps/unix/sysv/linux/sh/sys/user.h glibc-2.7/sysdeps/unix/sysv/linux/sh/sys/user.h

--- glibc-2.7.orig/sysdeps/unix/sysv/linux/sh/sys/user.h	2008-10-22 21:23:32.000000000 +0200

+++ glibc-2.7/sysdeps/unix/sysv/linux/sh/sys/user.h	2008-10-22 21:33:34.000000000 +0200

@@ -21,8 +21,6 @@

 #include <features.h>

-#include <asm/user.h>

-

 #undef start_thread

 #endif  /* sys/user.h */