ipkg: remove useless configure options

These options are part of the default set of options passed to
./configure by the AUTOTARGETS infrastructure.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/ipkg/ipkg.mk

@@ -11,7 +11,4 @@ IPKG_AUTORECONF = NO
 IPKG_INSTALL_STAGING = YES
 IPKG_INSTALL_TARGET = YES
 
-IPKG_CONF_OPT = --target=$(GNU_TARGET_NAME) --host=$(GNU_TARGET_NAME) \
-		--build=$(GNU_HOST_NAME) --prefix=/usr --sysconfdir=/etc
-
-$(eval $(call AUTOTARGETS,package,ipkg))
+$(eval $(call AUTOTARGETS,package,ipkg))