[U-Boot] Parallel make issue with helloworld.efi

[Tuomas Tynkkynen]

Hi,

Every now and then I see parallel builds failing, e.g. with
Linksprite_pcDuino3_Nano_defconfig:

   CC      lib/efi_loader/efi_bootmgr.o
   CC      lib/efi_loader/efi_disk.o
   CC      lib/efi_loader/efi_net.o
make[2]: *** No rule to make target 'lib/efi_loader/helloworld.efi', needed by '__build'.  Stop.
make[2]: *** Waiting for unfinished jobs....
   CC      lib/efi_loader/efi_smbios.o
make[1]: *** [scripts/Makefile.build:425: lib/efi_loader] Error 2
make: *** [Makefile:1279: lib] Error 2

This has been going for a while now (since ~2017.03 or so).
Anybody have ideas on how to express the dependency properly?

Thanks!
- Tuomas