synchronize the MdePkg/Include/Library/PcdLib.h and the MDE_Library_Spec.Add the commit for Macro in the PcdLib.h reference to the Spec.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6664 6f19259b-4bc3-4df7-8a09-765794883524
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