Update build-main.py

idk what I did, will fix later

Author: geofft

cpython-unix/build-main.py

@@ -182,8 +182,7 @@ def main():
     # because we can get some speedup from parallel operations. But we also don't
     # share a make job server with each build. So if we didn't limit the
     # parallelism we could easily oversaturate the CPU. Higher levels of
-
-:
+    # TODO(geofft)
     # a long, serial dependency chain that can't be built in parallel.
     parallelism = min(1 if args.serial else 4, multiprocessing.cpu_count())