branch is v2.X--[CMakeLists] Missing file in the included directory

[Red-F601]

after build all and install
test file_events_example(),
Undefined identifier file_event_handlers and filename_t

CMakeLists.txt：

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Library sources

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set(SPDLOG_HEADERS
"include/spdlog/common.h"
"include/spdlog/file_event_handlers.h" <- add
"include/spdlog/filename_t.h" <- add
……
）