Fix tools/cross_build_gcc.sh.

tools/cross_build_gcc.sh

Index: tools/cross_build_gcc.sh
diff --git a/tools/cross_build_gcc.sh b/tools/cross_build_gcc.sh
index b9e87280db72a8c95d8f98db059e43f5664eacf5..e3603cc786a9b2cdbfee30a50d5fd7f4939974ee 100755
--- a/tools/cross_build_gcc.sh
+++ b/tools/cross_build_gcc.sh
@@ -37,6 +37,7 @@ export AR=$1ar
 export RANLIB=$1ranlib
 export CC=$1gcc
 export LD=$1g++
+export LINK=$1g++
 
 OK=1
 if [ ! -x "$CXX" ]; then
@@ -59,6 +60,10 @@ if [ ! -x "$LD" ]; then
   echo "Error: $LD does not exist or is not executable."
   OK=0
 fi
+if [ ! -x "$LINK" ]; then
+  echo "Error: $LINK does not exist or is not executable."
+  OK=0
+fi
 if [ $OK -ne 1 ]; then
   exit 1
 fi