[coreboot-gerrit] Patch merged into coreboot/master: arches: lib: add main_decl.h for main() declaration

the following patch was just integrated into master:
commit 622eea7e815af39dbee290eddc487baab5e8a5f5
Author: Aaron Durbin 
Date:   Wed Feb 10 23:15:07 2016 -0600

arches: lib: add main_decl.h for main() declaration

It is silly to have a single header to declare the main()
    symbol, however some of the arches provided it while
    lib/bootblock.c relied on the arch headers to declare it. Just
    move the declaration into its own header file and utilize it.

Change-Id: I743b4c286956ae047c17fe46241b699feca73628
    Signed-off-by: Aaron Durbin 
    Reviewed-on: https://review.coreboot.org/13681
    Reviewed-by: Patrick Georgi 
    Tested-by: build bot (Jenkins)

See https://review.coreboot.org/13681 for details.

-gerrit