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

ports/alut-demo/Makefile

 # Copyright (c) 2014 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.
 
 include $(NACL_SDK_ROOT)/tools/common.mk
 
 TARGET = alut-demo
-LIBS = alut openal ppapi_simple nacl_io ppapi_cpp ppapi
+LIBS = alut openal
 SOURCES = alut_hello_world.c
 INSTALL_DIR = $(NACL_PACKAGES_PUBLISH)/$(TARGET)/$(TOOLCHAIN)
 CFLAGS += -Wall -Werror
 
 ifeq ($(TOOLCHAIN),pnacl)
 EXEEXT=.pexe
 else
 EXEEXT=.nexe
 endif
 
@@ skipping 24 matching lines @@
         cp $(OUTDIR)/$(TARGET)*$(EXEEXT) $(INSTALL_DIR)
         cp $(OUTDIR)/$(TARGET).nmf $(INSTALL_DIR)
 ifeq ($(TOOLCHAIN),glibc)
           cp -r $(OUTDIR)/lib* $(INSTALL_DIR)
 endif
         cp index.html $(INSTALL_DIR)
 ifeq ($(TOOLCHAIN),pnacl)
         cp $(OUTDIR)/$(TARGET)*.bc $(INSTALL_DIR)
         sed -i.bak 's/x-nacl/x-pnacl/g' $(INSTALL_DIR)/index.html
 endif