Fix binutils, gcc, gcc-avr in devenv (after roll).

ports/binutils-2.25/build.sh

 # Copyright 2015 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 HOST_BUILD_DIR=${WORK_DIR}/build_host
 HOST_INSTALL_DIR=${WORK_DIR}/install_host
 
 export ac_cv_func_getrlimit=no
 
 EnableCliMain
@@ skipping 13 matching lines @@
 
   export PATH="${HOST_INSTALL_DIR}/bin:${PATH}"
   ChangeDir ${BUILD_DIR}
   EXTRA_CONFIGURE_ARGS="\
     --target=avr \
     --disable-nls \
     --disable-werror \
     --enable-deterministic-archives \
     --without-zlib"
 
+  export LIBS="${NACLPORTS_LIBS}"
   DefaultConfigureStep
 }
+
+BuildStep() {
+  export LIBS="${NACLPORTS_LIBS}"
+  DefaultBuildStep
+}