Fix boot.sh behavior when OpenFlow extensions are not available.

Makefile.am

@@ -1,7 +1,7 @@
 # The goal of -Wno-syntax here is just to suppress the Automake warning
 # about overriding distdir, below.
 AUTOMAKE_OPTIONS = foreign -Wno-syntax subdir-objects
-ACLOCAL_AMFLAGS = -I m4 -I ext/m4
+ACLOCAL_AMFLAGS = -I m4
 SUBDIRS = datapath
 
 if HAVE_DPKG_BUILDPACKAGE

acinclude.m4

@@ -118,7 +118,7 @@ AC_DEFUN([OFP_ENABLE_EXT],
        HAVE_EXT=no
        ;;
      (*)
-       if test -e "$srcdir/ext/configure"; then
+       if test -e "$srcdir/ext/automake.mk"; then
          HAVE_EXT=yes
        else
          HAVE_EXT=no

configure.ac

@@ -34,7 +34,6 @@ AC_PREREQ(2.59)
 AC_INIT(openflow, 0.9.0~b1, info@openflowswitch.org)
 AC_CONFIG_SRCDIR([README.hwtables])
 AC_CONFIG_MACRO_DIR([m4])
-AC_CONFIG_MACRO_DIR([ext/m4])
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_HEADERS([config.h])
 AM_INIT_AUTOMAKE