use target_include_directories() instead of include_directories().

Fixes #292.

Change-Id: If1cf4ad7836acd8d824a8b1e8de364a222a01e21
Reviewed-on: https://code-review.googlesource.com/c/re2/+/58150
Reviewed-by: Paul Wankadia <junyer@google.com>
1 file changed