libcurl: fix typo in configure option w/o OpenSSL

When not using OpenSSL, the correct option to configure is --without-ssl
with two dashes.

Fixes: b8b78e7e6a ("libcurl: Allow selection of TLS package libcurl will use")

Signed-off-by: Trent Piepho <tpiepho@impinj.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/libcurl/libcurl.mk

@@ -46,7 +46,7 @@ LIBCURL_CONF_ENV += LD_LIBRARY_PATH=$(if $(LD_LIBRARY_PATH),$(LD_LIBRARY_PATH):)
 LIBCURL_CONF_OPTS += --with-ssl=$(STAGING_DIR)/usr \
 	--with-ca-path=/etc/ssl/certs
 else
-LIBCURL_CONF_OPTS += -without-ssl
+LIBCURL_CONF_OPTS += --without-ssl
 endif
 
 ifeq ($(BR2_PACKAGE_LIBCURL_GNUTLS),y)