Switch from using 'nacl_main' to 'main' entry point

ports/binutils-2.25/build.sh

Index: ports/binutils-2.25/build.sh
diff --git a/ports/binutils-2.25/build.sh b/ports/binutils-2.25/build.sh
index f3daed0f24eb1eeef42d0c2fb2230216ec20e343..1a88f35b3c537f8a5b7cdbd0b69fa672ca5b0635 100644
--- a/ports/binutils-2.25/build.sh
+++ b/ports/binutils-2.25/build.sh
@@ -6,24 +6,22 @@ HOST_BUILD_DIR=${WORK_DIR}/build_host
 HOST_INSTALL_DIR=${WORK_DIR}/install_host
 
 export ac_cv_func_getrlimit=no
-export EXTRA_AM_CPPFLAGS="-Dmain=nacl_main"
-export EXTRA_LIBS="${NACL_CLI_MAIN_LIB} -lppapi_simple \
-  -lnacl_io -lppapi -l${NACL_CXX_LIB}"
+
+EnableCliMain
 
 BuildHostBinutils() {
   MakeDir ${HOST_BUILD_DIR}
   ChangeDir ${HOST_BUILD_DIR}
-  CC="gcc" EXTRA_LIBS="" EXTRA_AM_CPPFLAGS="" \
-      LogExecute ${SRC_DIR}/configure --prefix=${HOST_INSTALL_DIR} \
+  LogExecute ${SRC_DIR}/configure --prefix=${HOST_INSTALL_DIR} \
       --target=avr \
       --disable-nls
-  EXTRA_LIBS="" EXTRA_AM_CPPFLAGS="" LogExecute make
-  EXTRA_LIBS="" EXTRA_AM_CPPFLAGS="" LogExecute make install
+  LogExecute make
+  LogExecute make install
 }
 
 ConfigureStep() {
-  ChangeDir ${SRC_DIR}
   BuildHostBinutils
+
   export PATH="${HOST_INSTALL_DIR}/bin:${PATH}"
   ChangeDir ${BUILD_DIR}
   EXTRA_CONFIGURE_ARGS="\