libcurl: fix --without-ssl typo

Reported-by: Nestor <nestor@traceback.com.br>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/libcurl/libcurl.mk

@@ -20,7 +20,7 @@ LIBCURL_CONF_ENV += ac_cv_lib_crypto_CRYPTO_lock=yes
 LIBCURL_CONF_ENV += LD_LIBRARY_PATH=$$LD_LIBRARY_PATH:/lib:/usr/lib
 LIBCURL_CONF_OPT += --with-ssl=$(STAGING_DIR)/usr --with-random=/dev/urandom
 else
-LIBCURL_CONF_ENV += --without-ssl
+LIBCURL_CONF_OPT += --without-ssl
 endif
 
 $(eval $(call AUTOTARGETS,package,libcurl))