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Overriding a CMake package like this will just cause all sorts of
headaches later on. In this particular case, projects that depended on
CMake 2.8.13 or later (more likely 3.0.0) would fail with a message
about removing the CMakePackageConfigHelpers file, but would have no way
to do that while still using ECM.
This also renames the configure_package_config_file() macro to
ecm_configure_package_config_file(), so that anything including
CMakePackageConfigHelpers afterwards does not overwrite the macro
unexpectedly.
For now, we keep a CMakePackageConfigHelpers.cmake file that just wraps
ecm_configure_package_config_file() as configure_package_config_file()
to keep the frameworks building while they are ported.
REVIEW: 115496
Reviewed by Sune Vuorela <kde@pusling.com>
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