MdeMdeModulePkg/BootScriptExecutorDxe: Replaces absolute addressing that requires a relocation entry with PC relative addressing that does not require a relocation entry. This patch is required to make this file assemble and link with Xcode

Signed-off-by: Andrew Fish <afish@apple.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14279 6f19259b-4bc3-4df7-8a09-765794883524