overload libc memory allocators with custom ones to trace all allocations (#13810)

* overload libc memory allocators with custom ones to trace all allocations

* grab libc pointers for external c plugins

* use -ldl when necessary; fallback to work without dlsym when it is not available

* initialize global variable

* add optional dl libs

* dynamically link every library function when needed for the first time

* prevent crashes on musl libc

* another attempt

* dont dereference function

* attempt no 3

* attempt no 4

* cleanup - all attempts failed

* dont enable tracing of allocations

* missing parenthesis

1 files changed, 1 insertions, 1 deletions

diff --git a/ml/ml.cc b/ml/ml.cc
index 60ea8d60cb..cf2fd59798 100644
--- a/ml/ml.cc
+++ b/ml/ml.cc
@@ -111,7 +111,7 @@ char *ml_get_host_info(RRDHOST *RH) {
         ConfigJson["enabled"] = false;
     }
 
-    return strdup(ConfigJson.dump(2, '\t').c_str());
+    return strdupz(ConfigJson.dump(2, '\t').c_str());
 }
 
 char *ml_get_host_runtime_info(RRDHOST *RH) {