[pfff] export findlib target for lang_php/matcher

Summary:

Similar to the last couple.

Test Plan:

  make uninstall-findlib
  cd lang_php/matcher
  make install-findlib
  make uninstall-findlib
  cd ../..
  make install-findlib
  make uninstall-findlib

Reviewers: pieter

Reviewed By: pieter

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Task ID: #

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