gcc-runtime builds libstdc++ separately from gcc-cross-*. Its configure tests using g++ 
will not run correctly since my default the linker will try and link against libstdc++
which shouldn't exist yet. We need an option to disable the automatically added -lstdc++
option whilst leaving -lc, -lgcc and other automatic library dependencies. This patch 
adds such an option which only disables the -lstdc++ linkage.

A "standard" gcc build uses xgcc and hence avoids this. We should ask upstream how to 
do this officially, the likely answer is don't build libstdc++ separately.

RP 29/6/10

Index: gcc-4.3.3/gcc/cp/g++spec.c
===================================================================
--- gcc-4.3.3.orig/gcc/cp/g++spec.c	2010-06-29 00:06:03.901695025 +0100
+++ gcc-4.3.3/gcc/cp/g++spec.c	2010-06-29 00:06:58.800325439 +0100
@@ -131,6 +131,7 @@
       if (argv[i][0] == '-')
 	{
 	  if (strcmp (argv[i], "-nostdlib") == 0
+	      || strcmp (argv[i], "-nostdlib++") == 0
 	      || strcmp (argv[i], "-nodefaultlibs") == 0)
 	    {
 	      library = -1;