EdkCompatibilityPkg: Fixed EDK Shell build

Fixed:
- Removed unused variables
- Function does not return value.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>


git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14796 6f19259b-4bc3-4df7-8a09-765794883524