CMake-Windows-Qt5.13

调整Mdi例子中cmake的文件大小写，避免在linux系统下大小写敏感 #182

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Run time

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Job	Run time
windows-2019-Qt-5.13.*-shared-ON	2m 14s
windows-latest-Qt-5.13.*-shared-ON	1m 50s
	4m 4s