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configure: avoid default when CROSS is set to null

avoids picking up defaults if CROSS is forcibly set empty as in:
$ CROSS= ./configure ...

BUG=1121

Change-Id: I6af91959288dede01efe3e5945698ab249eb6ec3

--- a/build/make/configure.sh

+++ b/build/make/configure.sh

@@ -877,7 +877,7 @@

       case ${tgt_cc} in

         gcc)

-          CROSS=${CROSS:-arm-none-linux-gnueabi-}

+          CROSS=${CROSS-arm-none-linux-gnueabi-}

           link_with_cc=gcc

           setup_gnu_toolchain

           arch_int=${tgt_isa##armv}

@@ -1135,7 +1135,7 @@

           CC=${CC:-${CROSS}gcc}

           CXX=${CXX:-${CROSS}g++}

           LD=${LD:-${CROSS}gcc}

-          CROSS=${CROSS:-g}

+          CROSS=${CROSS-g}

           ;;

         os2)

           disable_feature pic