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>

Don't generate RPATH if we're going to be generating RUNPATH.

need to ponder what ramifications this has before enabling it

--- binutils/bfd/elflink.c

+++ binutils/bfd/elflink.c

@@ -5382,11 +5382,15 @@

 	  indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,

 				      TRUE);

-	  if (indx == (bfd_size_type) -1

-	      || !_bfd_elf_add_dynamic_entry (info, DT_RPATH, indx))

+	  if (indx == (bfd_size_type) -1)

 	    return FALSE;

-	  if  (info->new_dtags)

+	  if (!info->new_dtags)

+	    {

+	      if (!_bfd_elf_add_dynamic_entry (info, DT_RPATH, indx))

+		return FALSE;

+	    }

+	  else

 	    {

 	      _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, indx);

 	      if (!_bfd_elf_add_dynamic_entry (info, DT_RUNPATH, indx))