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>

 --- gcc-4.3.2.orig/gcc/config/arm/linux-eabi.h	2009-09-08 23:46:44.000000000 +0200

 +++ gcc-4.3.2/gcc/config/arm/linux-eabi.h	2009-09-08 23:46:51.000000000 +0200

 @@ -44,7 +44,7 @@

     The ARM10TDMI core is the default for armv5t, so set

     SUBTARGET_CPU_DEFAULT to achieve this.  */

  #undef  SUBTARGET_CPU_DEFAULT

 -#define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm10tdmi

 +#define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm9tdmi

  /* TARGET_BIG_ENDIAN_DEFAULT is set in

     config.gcc for big endian configurations.  */