swig: unbreak host-swig build when host has octave installed

But not the octave development package:

checking for octave... octave
checking for mkoctfile... configure: error: mkoctfile is not installed

We don't need octace support, so fix it by explictly disabling it.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/swig/swig.mk

@@ -7,7 +7,10 @@
 SWIG_VERSION = 2.0.10
 SWIG_SITE = http://downloads.sourceforge.net/project/swig/swig/swig-$(SWIG_VERSION)
 SWIG_DEPENDENCIES = host-bison
-HOST_SWIG_CONF_OPT = --without-pcre --disable-ccache
+HOST_SWIG_CONF_OPT = \
+	--without-pcre \
+	--disable-ccache \
+	--without-octave
 SWIG_LICENSE = GPLv3+ BSD-2c BSD-3c
 SWIG_LICENSE_FILES = LICENSE LICENSE-GPL LICENSE-UNIVERSITIES