Patch merged into coreboot/master: documentation: Update the document about building coreboot

the following patch was just integrated into master:
commit dea0a7f9ae03eba9b2b0f53da415b057c778ba82
Author: Zheng Bao 
Date:   Tue Nov 17 23:50:14 2015 +0800

documentation: Update the document about building coreboot

The previous LinuxBIOS-AMD64.tex was still working with subversion.

We need a document to give the preliminary steps to build coreboot
    for a new guys.

Change-Id: I64240c8344456e724f0823680e0534cf1db4c4a8
    Signed-off-by: Zheng Bao 
    Signed-off-by: Zheng Bao 
    Reviewed-on: http://review.coreboot.org/4510
    Tested-by: build bot (Jenkins)
    Reviewed-by: Patrick Georgi

See http://review.coreboot.org/4510 for details.

-gerrit