BaseTools/GenFw: remove ARM and RVCT references from ELF64 code
BaseTools/GenFw: remove ARM and RVCT references from ELF64 code

ARM and RVCT apply to 32-bit code only, so remove any references
to them (including the workaround for the linker) from the 64-bit
version of ElfConvert.c

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

git-svn-id: 3158a46dfd52e07d1fda3e32e1ab2e353a00b20f@18539 6f19259b-4bc3-4df7-8a09-765794883524

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