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>

# Binary utilities menu

menu "Binary utilities"

choice

    bool

    prompt "Binary format:"

if ARCH_USE_MMU || BARE_METAL

config ARCH_BINFMT_ELF

    bool

    prompt "ELF"

    help

      This will make your system build ELF exectubales,

      suitable for architectures with an MMU.

endif # ARCH_USE_MMU

if ! ARCH_USE_MMU

config ARCH_BINFMT_FLAT

    bool

    prompt "Flat"

    help

      This will build flat binaries, suitable for

      MMU-less architectures.

config ARCH_BINFMT_FDPIC

    bool

    prompt "FD_PIC ELF"

    help

      This will build FD_PIC ELF binaries, suitable for

      MMU-less architectures that still require to use

      shared libraries (FIXME).

endif # ! ARCH_USE_MMU

endchoice

source "config/binutils/binutils.in"

source "config/binutils/elf2flt.in"

source "config/binutils/sstrip.in"

endmenu