BaseTools: Fix the problem using FILE_GUID override in .dsc
BaseTools: Fix the problem using FILE_GUID override in .dsc

https://bugzilla.tianocore.org/show_bug.cgi?id=1330

This patch is going to fix the problem using FILE_GUID override in .dsc.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: BobCF <f53a8c5610dbb66123cb988c78ae464e9da7199c@intel.com>
Cc: Liming Gao <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>
Cc: Jaben Carsey <2d4ee76b36e91bee3a58378b7538904eb027a616@intel.com>
Reviewed-by: Liming Gao <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>

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