[coreboot] make crossgcc-i386 : ubsan.c error (with fix!) for GCC

[qma ster]

Good day! While building the coreboot's toolchain by using GCC 7.1.1
version, I am getting the following error:

ubsan.c:1474:23: error: ISO C++ forbids comparison between pointer and
integer [-fpermissive]
       || xloc.file == '\0' || xloc.file[0] == '\xff'

The fix is very simple - just open
./util/crossgcc/gcc-6.3.0/gcc/ubsan.c and change

       || xloc.file == '\0' || xloc.file[0] == '\xff'

to

       || xloc.file[0] == '\0' || xloc.file[0] == '\xff'

Found this solution here -
https://patchwork.openembedded.org/patch/138884/ . Would be great if
you could somehow import it to your code

Best regards,
qmastery