[AIX] Fix Compiler Flags and Bugs on AIX to Pass All Tests (#3219)

* Fixing compiler warnings

* Replace the old -s flag with the -Wl,-s flag

* Fixing compiler warnings

* Fixing the linker strip flag and tests/code not working as expected on AIX

programs/util.c

@@ -1378,6 +1378,9 @@ int UTIL_countCores(int logical)
 
 int UTIL_countCores(int logical)
 {
+    /* suppress unused parameter warning */
+    (void)logical;
+
     /* assume 1 */
     return 1;
 }