make distclean leaves a bunch of files/directories around from previous builds

[thomasvl]

What version of protobuf and what language are you using? Version: master Language: N/A - All

What operating system (Linux, Windows, ...) and version? macOS

What runtime / compiler are you using (e.g., python version or gcc version) N/A

What did you do? Steps to reproduce the behavior:

1. Checkout master.
2. ./autogen.sh
3. ./configure CPPFLAGS="-mmacosx-version-min=10.9 -Wunused-const-variable -Wunused-function" CXXFLAGS="-Wnon-virtual-dtor -Woverloaded-virtual -Wno-sign-compare"
4. make -j 4 all check
5. make distclean
6. git status --ignored

What did you expect to see

No local files that aren't tracked in git.

What did you see instead?

The make distclean should remove all intermediates/temps/etc., but instead a bunch of things are left so the next build isn't completely from scratch.

Anything else we should know about your project / environment

[thomasvl]

ps - doing a make within conformance also cause other things to get left behind.

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