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install also the header files, so that OCamlSDL2_Image and OCamlSDL2_TTF can find them
Revert "install also the header files, so that OCamlSDL2_Image and OCamlSDL2_TTF can find them"

This reverts commit 99ced9d5940d09285cf3b4cbd74c48ba79f80b01.
Add findinstall_h rule
Merge pull request #5 from codename68/master

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