ignore RTEXT_FILTER_* constants for non-GNU Linux libc checks

Author: jreppnow

libc-test/build.rs

@@ -3424,6 +3424,7 @@ fn test_linux(target: &str) {
                 || name.starts_with("P_")
                 || name.starts_with("PF_")
                 || name.starts_with("RLIMIT_")
+                || name.starts_with("RTEXT_FILTER_")
                 || name.starts_with("SOL_")
                 || name.starts_with("STATX_")
                 || name.starts_with("SW_")