roms: Add a 'make help' target alias

Various C projects provide a 'make help' target. Our root directory
does so. The roms/ directory lacks a such rule, but already displays
a help output when the default target is called.
Add a 'help' target aliased to the default one, to avoid:

  $ make -C roms help
  make: *** No rule to make target 'help'.  Stop.
Reviewed-by: default avatarJohn Snow <jsnow@redhat.com>
Reviewed-by: default avatarLaszlo Ersek <lersek@redhat.com>
Message-Id: <20190920171159.18633-1-philmd@redhat.com>
Signed-off-by: default avatarPhilippe Mathieu-Daudé <philmd@redhat.com>
parent f3e330e3
......@@ -51,7 +51,7 @@ SEABIOS_EXTRAVERSION="-prebuilt.qemu.org"
#
EDK2_EFIROM = edk2/BaseTools/Source/C/bin/EfiRom
default:
default help:
@echo "nothing is build by default"
@echo "available build targets:"
@echo " bios -- update bios.bin (seabios)"
......
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