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

ports/curl/build.sh

 # Copyright (c) 2013 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.
 
 export ac_cv_func_gethostbyname=yes
 export ac_cv_func_getaddrinfo=no
 export ac_cv_func_connect=yes
 
 # Can't use LIBS here otherwise nacl-spawn gets linked into the libcurl.so
 # which we don't ever want.
-export EXTRA_LIBS="${NACL_CLI_MAIN_LIB} -l${NACL_CXX_LIB}"
+export EXTRA_LIBS="${NACL_CLI_MAIN_LIB}"
+NACLPORTS_LDFLAGS+=" ${NACL_CLI_MAIN_LDFLAGS}"
 
 EnableGlibcCompat
 
 EXECUTABLES="src/curl${NACL_EXEEXT}"
 
 EXTRA_CONFIGURE_ARGS+=" --without-libssh2"
 if [ "${NACL_DEBUG}" = "1" ]; then
   NACLPORTS_CPPFLAGS+=" -DDEBUGBUILD"
   EXTRA_CONFIGURE_ARGS+=" --enable-debug --disable-curldebug"
 fi
@@ skipping 35 matching lines @@
       ${PUBLISH_DIR}/curl*${NACL_EXEEXT} \
       -L${DESTDIR_LIB} \
       -s . \
       -o curl.nmf
   popd
 
   InstallNaClTerm ${PUBLISH_DIR}
   LogExecute cp ${START_DIR}/index.html ${PUBLISH_DIR}
   LogExecute cp ${START_DIR}/curl.js ${PUBLISH_DIR}
 }