Add TODOS about nob leaks.

nob.cpp

@@ -64,20 +64,22 @@ void make_and_run_cmd(std::array<Cstr, N> strings)
     Cmd cmd;
     cmd.line.count = strings.size();
     cmd.line.elems = strings.data();
-    //TODO FIX leaks.
+    //TODO FIX cmd_show leak.
     INFO("make_and_run_cmd: %s", cmd_show(cmd));
     cmd_run_sync(cmd);
 }
 
 void build_cpp_file(std::string_view filename)
 {
     Cstr path = PATH(filename.data());
+    //TODO FIX NOEXT leak.
     make_and_run_cmd(std::array{"g++", CPPFLAGS, "-o", NOEXT(path), path});
 }
 
 void build_and_run_gtest_file(std::string_view filename)
 {
     Cstr path = PATH(filename.data());
+    //TODO FIX NOEXT leak.
     CMD("g++", CPPFLAGS, "-o", NOEXT(path), path, "-lgtest");
     CMD(NOEXT(path));
 }