[CMake] put python header in include
Otherwise, this header is installed if BUILD_PYTHON_INTERFACE, and not if INSTALL_PYTHON_INTERFACE_ONLY. But if we want to be able to have binary packages for: - the main curve package - its bindings for python 2 - its bindings for python 3 this header will be installed in the 2 last cases, which will conflict. In short: if we set INSTALL_PYTHON_INTERFACE_ONLY, there should be only stuff installed in PYTHON_SITELIB.
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