Merge changes I51d42a50,Id8aaf820,I6af91959

* changes:
  configure: extend armv7 hf target autodetect
  configure: remove default CROSS for arm targets
  configure: avoid default when CROSS is set to null

build/make/configure.sh

@@ -647,7 +647,7 @@ process_common_toolchain() {
       armv6*)
         tgt_isa=armv6
         ;;
-      armv7*-hardfloat*)
+      armv7*-hardfloat* | armv7*-gnueabihf | arm-*-gnueabihf)
         tgt_isa=armv7
         float_abi=hard
         ;;
@@ -877,7 +877,6 @@ process_common_toolchain() {
 
       case ${tgt_cc} in
         gcc)
-          CROSS=${CROSS:-arm-none-linux-gnueabi-}
           link_with_cc=gcc
           setup_gnu_toolchain
           arch_int=${tgt_isa##armv}
@@ -1135,7 +1134,7 @@ EOF
           CC=${CC:-${CROSS}gcc}
           CXX=${CXX:-${CROSS}g++}
           LD=${LD:-${CROSS}gcc}
-          CROSS=${CROSS:-g}
+          CROSS=${CROSS-g}
           ;;
         os2)
           disable_feature pic