perf: experiment with turning off run time cache

Author: morrisonlevi

profiling/build.rs

@@ -322,12 +322,8 @@ fn cfg_preload(vernum: u64) -> bool {
 
 fn cfg_run_time_cache(vernum: u64) -> bool {
     println!("cargo::rustc-check-cfg=cfg(php_run_time_cache)");
-    if vernum >= 80000 {
-        println!("cargo:rustc-cfg=php_run_time_cache");
-        true
-    } else {
-        false
-    }
+    let _ = vernum;
+    false
 }
 
 fn cfg_trigger_time_sample() -> bool {