Use EFIAPI ABI introduced in latest nightly#104

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GabrielMajeri merged 2 commits intorust-osdev:masterfrom

roblabla:efiapi

Nov 5, 2019

Commits on Oct 30, 2019

Use EFIAPI ABI introduced in latest nightly
roblabla
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Commits on Nov 1, 2019

DOc the requirement of feature(abi_efiapi)
roblabla
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