Fix empty CMAKE_CXX_FLAGS_RELEASE if libaom local #2367
Merged
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Fix empty CMAKE_CXX_FLAGS_RELEASE if libaom is built locally using FetchContent and AVIF_LIBYUV is OFF.
libaom sets CMAKE_CXX_FLAGS_RELEASE and other flags as CACHE variables. To undo the changes libaom makes, unset the variables as cache variables so that they can be reset to their original values as normal variables.
Fix #2365.