Adding search_env_path OSX introspection.

radixcore/tests/tstSystem.cc

@@ -214,6 +214,9 @@ TEST(System, SearchEnvPath)
 #ifdef _WIN32
   app     = "where.exe";
   blessed = "c:\\Windows\\System32\\where.exe";
+#elif __APPLE__
+  app     = "ls";
+  blessed = "/bin/ls";
 #else
   app     = "ls";
   blessed = "/usr/bin/ls";