package/octave: add optional zlib support

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit fa54abf730ea11bfadd432b645a0735a7b4fe852)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/octave/octave.mk

@@ -28,4 +28,11 @@ else
 OCTAVE_CONF_OPTS += --disable-readline
 endif
 
+ifeq ($(BR2_PACKAGE_ZLIB),y)
+OCTAVE_CONF_OPTS += --with-z
+OCTAVE_DEPENDENCIES += zlib
+else
+OCTAVE_CONF_OPTS += --without-z
+endif
+
 $(eval $(autotools-package))