Add abi_efiapi feature

Author: jasoncouture

uefi/src/main.rs

@@ -1,6 +1,7 @@
 #![no_std]
 #![no_main]
 #![deny(unsafe_op_in_unsafe_fn)]
+#![feature(abi_efiapi)]
 
 use crate::memory_descriptor::UefiMemoryDescriptor;
 use bootloader_api::info::FrameBufferInfo;