rename main program and add AM conditional

Makefile.am

@@ -12,7 +12,7 @@ dist_man8_MANS=bgpq4.8
 bgpq4_LDADD = $(PLATFORM_LDADD) $(PROG_LDADD)
 bgpq4_LDADD += $(top_builddir)/compat/libcompat.la
 
-bgpq4_SOURCES=bgpq4.c extern.h bgpq4_printer.c bgpq_expander.c \
+bgpq4_SOURCES=main.c extern.h bgpq4_printer.c bgpq_expander.c \
     expander_freeall.c sx_maxsockbuf.c \
     sx_prefix.c sx_prefix.h sx_report.c sx_report.h \
     sx_slentry.c sx_slentry.h

configure.ac

@@ -107,6 +107,7 @@ AC_CHECK_LIB(nsl,getaddrinfo)
 
 AC_CHECK_HEADERS([sys/cdefs.h sys/queue.h sys/tree.h sys/select.h])
 
+AM_CONDITIONAL([HAVE_PLEDGE], [test "x$ac_cv_func_pledge" = xyes])
 AM_CONDITIONAL([HAVE_STRLCPY], [test "x$ac_cv_func_strlcpy" = xyes])
 
 AC_CONFIG_FILES([