Changing the efi compiler this way doesn't really work. The gnu-efi header checks as well as supported compiler flag checks use the regular cc that meson detects. Changing the compiler this way will end up with bad compiler flags. For the very same reason, this does not work with a cross-compiler without going through proper meson cross-compilation steps either. The proper way to build systemd-boot with a different compiler is to use a different build folder and then just use the proper ninja build target to only build the bootloader/stub.
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