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: John Snow <jsnow@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20190920171159.18633-1-philmd@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>

diff --git a/roms/Makefile b/roms/Makefile
index 6cf07d3b44eebcb09b69c442356b47243693c88c..3ffd13cc7e45e3d6385e5eb714f5ca6cddff708b 100644 (file)
--- a/roms/Makefile
+++ b/roms/Makefile
@@ -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)"