Revert "util: jsoncompat: Stub out virJSONInitialize when compiling without jansson"

This reverts commit 9e44c2db.

Jansson cannot parse QEMU's quirky JSON.
Revert back to yajl.

https://bugzilla.redhat.com/show_bug.cgi?id=1614569Signed-off-by: NJán Tomko <jtomko@redhat.com>
Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>

src/util/virjsoncompat.c

@@ -271,15 +271,4 @@ json_true_impl(void)
     return json_true_ptr();
 }
 
-
-#else /* !WITH_JANSSON */
-
-
-int
-virJSONInitialize(void)
-{
-    return 0;
-}
-
-
-#endif /* !WITH_JANSSON */
+#endif /* WITH_JANSSON */