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

ports/thttpd/Makefile

 # Generated automatically from Makefile.in by configure.
 # Makefile.in for thttpd
 #
 # Copyright © 1995,1998 by Jef Poskanzer <jef@mail.acme.com>.
 # All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
 # 1. Redistributions of source code must retain the above copyright
@@ skipping 35 matching lines @@
 CGIBINDIR =     $(WEBDIR)/cgi-bin
 
 # You shouldn't need to edit anything below here.
 
 CC =            $(NACLCC)
 CXX =           $(NACLCXX)
 CCOPT =         -O0
 DEFS =          -DHAVE_DAEMON=1 -DHAVE__PROGNAME=1 -DHAVE_GRP_H=1 -DHAVE_MEMORY_H=1 -DHAVE_PATHS_H=1 -DTIME_WITH_SYS_TIME=1 -DHAVE_DIRENT_H=1 -DHAVE_LIBCRYPT=1 -DHAVE_STRERROR=1 -DHAVE_VSNPRINTF=1  -DHAVE_SETSID=1 -DHAVE_GETADDRINFO=1 -DHAVE_GETNAMEINFO=1 -DHAVE_GAI_STRERROR=1 -DHAVE_SIGSET=1 -DHAVE_ATOLL=1 -DHAVE_UNISTD_H=1 -DHAVE_GETPAGESIZE=1 -DHAVE_SELECT=1 -DHAVE_TM_GMTOFF=1 -DHAVE_INT64T=1 -DHAVE_SOCKLENT=1 
 INCLS =         -I. $(NACLPORTS_CPPFLAGS)
 CFLAGS =        $(CCOPT) $(DEFS) $(NACLPORTS_CFLAGS) $(INCLS)
-LDFLAGS =       -lcrypt -ljsoncpp ${NACL_CLI_MAIN_LIB} $(NACLPORTS_LDFLAGS) -pthread
+LDFLAGS =       $(NACLPORTS_LDFLAGS) -lcrypt -ljsoncpp $(NACLPORTS_LIBS) -pthread
 LIBS =
 NETLIBS =       
 INSTALL =       /usr/bin/install -c
 
 .c.o:
         @rm -f $@
         $(CC) $(CFLAGS) -c $*.c
 
 .cpp.o:
         @rm -f $@
@@ skipping 65 matching lines @@
 thttpd.o:       config.h version.h libhttpd.h fdwatch.h mmc.h timers.h match.h \
             my_syslog.h
 libhttpd.o:     config.h version.h libhttpd.h mime_encodings.h mime_types.h \
                 mmc.h timers.h match.h tdate_parse.h my_syslog.h
 syslog.o: my_syslog.h
 fdwatch.o:      fdwatch.h
 mmc.o:          mmc.h libhttpd.h my_syslog.h
 timers.o:       timers.h
 match.o:        match.h
 tdate_parse.o:  tdate_parse.h