Use the multilib config files from ${B} instead of using the ones from ${S}
so that the source can be shared between gcc-cross-initial,
gcc-cross-intermediate, gcc-cross, gcc-runtime, and also the sdk build.

Upstream-Status: Inappropriate [configuration]
Signed-off-by: Constantin Musca <constantinx.musca@intel.com>

Index: gcc-4.7.2/gcc/configure
===================================================================
--- gcc-4.7.2.orig/gcc/configure
+++ gcc-4.7.2/gcc/configure
@@ -11717,10 +11717,20 @@ done
 tmake_file_=
 for f in ${tmake_file}
 do
-	if test -f ${srcdir}/config/$f
-	then
-		tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
-	fi
+  case $f in
+    */t-linux64 )
+       if test -f ./config/$f
+       then
+         tmake_file_="${tmake_file_} ./config/$f"
+       fi
+       ;;
+    * )
+       if test -f ${srcdir}/config/$f
+       then
+         tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
+       fi
+       ;;
+  esac
 done
 tmake_file="${tmake_file_}"
 
@@ -11731,6 +11741,10 @@ tm_file_list="options.h"
 tm_include_list="options.h insn-constants.h"
 for f in $tm_file; do
   case $f in
+    */linux64.h )
+       tm_file_list="${tm_file_list} ./config/$f"
+       tm_include_list="${tm_include_list} ./config/$f"
+       ;;
     ./* )
        f=`echo $f | sed 's/^..//'`
        tm_file_list="${tm_file_list} $f"
Index: gcc-4.7.2/gcc/configure.ac
===================================================================
--- gcc-4.7.2.orig/gcc/configure.ac
+++ gcc-4.7.2/gcc/configure.ac
@@ -1701,10 +1701,20 @@ done
 tmake_file_=
 for f in ${tmake_file}
 do
-	if test -f ${srcdir}/config/$f
-	then
-		tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
-	fi
+  case $f in
+    */t-linux64 )
+       if test -f ./config/$f
+       then
+         tmake_file_="${tmake_file_} ./config/$f"
+       fi
+       ;;
+    * )
+       if test -f ${srcdir}/config/$f
+       then
+         tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
+       fi
+       ;;
+  esac
 done
 tmake_file="${tmake_file_}"
 
@@ -1715,6 +1725,10 @@ tm_file_list="options.h"
 tm_include_list="options.h insn-constants.h"
 for f in $tm_file; do
   case $f in
+    */linux64.h )
+       tm_file_list="${tm_file_list} ./config/$f"
+       tm_include_list="${tm_include_list} ./config/$f"
+       ;;
     ./* )
        f=`echo $f | sed 's/^..//'`
        tm_file_list="${tm_file_list} $f"