hx509: Build libhx509template and hxtool with it

lib/hx509/hxtool.c

@@ -754,7 +754,6 @@ print_f(hx509_context hxcontext, void *ctx, hx509_cert cert)
 static int HX509_LIB_CALL
 print_fjson(hx509_context hxcontext, void *ctx, hx509_cert cert)
 {
-#ifdef ASN1_PRINTING_WORKS
     const Certificate *c = NULL;
     char *json = NULL;
 
@@ -767,10 +766,6 @@ print_fjson(hx509_context hxcontext, void *ctx, hx509_cert cert)
         hx509_err(context, 1, errno, "Could not format certificate as JSON");
     free(json);
     return 0;
-#else
-    err(1, "JSON printing of certificates not supported; try enabling or "
-        "not disabling ASN.1 templating in Heimdal build configuration");
-#endif
 }