gutenprint: forcibly disable ijs-config

ijs-config (ghostscript) is looked up in /usr/bin, if you've got a host
that has ghostscript with development headers installed then the build
fails when trying to link to the host libijs.
Forcibly disable ghostscript support since we lack a package.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/gutenprint/gutenprint.mk

@@ -22,7 +22,8 @@ GUTENPRINT_DEPENDENCIES = cups host-pkgconf \
 # so we need to build both a host package and a target package
 GUTENPRINT_DEPENDENCIES += host-gutenprint
 
-GUTENPRINT_CONF_ENV = ac_cv_path_CUPS_CONFIG=$(STAGING_DIR)/usr/bin/cups-config
+GUTENPRINT_CONF_ENV = ac_cv_path_CUPS_CONFIG=$(STAGING_DIR)/usr/bin/cups-config \
+	ac_cv_path_IJS_CONFIG=""
 
 GUTENPRINT_CONF_OPT = --disable-libgutenprintui2 \
                       --disable-samples \