dropbear: remove shared config.cache workaround

Now that the shared config.cache handling has been removed.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/dropbear/dropbear.mk

@@ -9,11 +9,6 @@ DROPBEAR_SOURCE = dropbear-$(DROPBEAR_VERSION).tar.gz
 DROPBEAR_SITE = http://matt.ucc.asn.au/dropbear/releases
 DROPBEAR_DEPENDENCIES = zlib
 DROPBEAR_TARGET_BINS = dbclient dropbearkey dropbearconvert scp ssh
-# configure misdetects this as no, but the result is not used for
-# anything. Unfortunately it breaks the build for other packages also
-# checking for struct sockaddr_storage when using a shared config
-# cache, so force it to yes
-DROPBEAR_CONF_ENV = ac_cv_type_struct_sockaddr_storage=yes
 DROPBEAR_MAKE =	$(MAKE) MULTI=1 SCPPROGRESS=1 \
 		PROGRAMS="dropbear dbclient dropbearkey dropbearconvert scp"