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/Makerules glibc-2.7/Makerules

--- glibc-2.7.orig/Makerules	2007-08-26 04:18:03.000000000 +0200

+++ glibc-2.7/Makerules	2008-07-28 15:17:27.000000000 +0200

@@ -1203,6 +1203,9 @@

 # The include magic above causes those files to use this variable for flags.

 CPPFLAGS-nonlib = -DNOT_IN_libc=1

+ifneq ($(OBJDUMP_FOR_HOST),)

+OBJDUMP = $(OBJDUMP_FOR_HOST)

+endif

 ifeq ($(versioning),yes)

 # Generate normalized lists of symbols, versions, and data sizes.