package/s390-tools: needs OpenSSL-enabled libcurl

Fix the following build failure raised bump to version 2.17.0 in commit
eab9110afbef9c39569c4cc988aed15c48f7ce44 and
https://github.com/ibm-s390-linux/s390-tools/commit/56fecf1832c3ebc4626ddf5c598762833c362d5e:

Error: libcurl is not built with the OpenSSL backend

Fixes:
 - http://autobuild.buildroot.org/results/32aa8f0bece5da2a16d761f175d46c7d3e0a8965
 - http://autobuild.buildroot.org/results/535253f483c927da456c0be292df6a58c1f39737

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 889fd54f809973d56b98e78677ae8a14e9e64da4)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/s390-tools/s390-tools.mk

@@ -14,7 +14,7 @@ S390_TOOLS_MAKE_OPTS = \
 	ARCH=$(BR2_ARCH) \
 	CFLAGS="$(TARGET_CFLAGS) -D_GNU_SOURCE"
 
-ifeq ($(BR2_PACKAGE_LIBCURL),y)
+ifeq ($(BR2_PACKAGE_LIBCURL_OPENSSL),y)
 S390_TOOLS_DEPENDENCIES += libcurl
 S390_TOOLS_MAKE_OPTS += \
 	CURL_CONFIG=$(STAGING_DIR)/usr/bin/curl-config \