MdeModulePkg: Fix undefined reference to memcpy with XCODE5

MdeModulePkg: Fix undefined reference to memcpy with XCODE5

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3098

XCODE5 toolchain in NOOPT mode generates memcpy when trying
to copy PEI_CORE_FV_HANDLE structure. This breaks OVMF
compilation with XCODE5.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Signed-off-by: Vitaly Cheptsov <cheptsov@ispras.ru>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>