package/mongoose: fix activation of openssl/mbedtls

MG_ENABLE_SSL and MG_SSL_IF have been dropped since version 7.0 and
https://github.com/cesanta/mongoose/commit/f2fba1d2004c5ddf2fc0a7ca8dc75b5f78feed85

So use the new MG_ENABLE_OPENSSL and MG_ENABLE_MBEDTLS variables

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/mongoose/mongoose.mk

@@ -16,14 +16,10 @@ MONGOOSE_CFLAGS = $(TARGET_CFLAGS)
 
 ifeq ($(BR2_PACKAGE_OPENSSL),y)
 MONGOOSE_DEPENDENCIES += openssl
-MONGOOSE_CFLAGS += \
-	-DMG_ENABLE_SSL \
-	-DMG_SSL_IF=MG_SSL_IF_OPENSSL
+MONGOOSE_CFLAGS += -DMG_ENABLE_OPENSSL=1
 else ifeq ($(BR2_PACKAGE_MBEDTLS),y)
 MONGOOSE_DEPENDENCIES += mbedtls
-MONGOOSE_CFLAGS += \
-	-DMG_ENABLE_SSL \
-	-DMG_SSL_IF=MG_SSL_IF_MBEDTLS
+MONGOOSE_CFLAGS += -DMG_ENABLE_MBEDTLS=1
 endif
 
 define MONGOOSE_BUILD_CMDS