[coreboot-gerrit] [M] Change in coreboot[master]: arch,toolchain,xcompile: Use GCC as linker

[Paul Menzel (Code Review)]

Attention is currently required from: Raul Rangel, Stefan Reinauer, Julius Werner, Jacob Garber, Iru Cai.

Paul Menzel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/40811 )

Change subject: arch,toolchain,xcompile: Use GCC as linker
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Patch Set 10:

(1 comment)

Patchset:

PS10: 
From the build bot (Jenkins):

qemu-q35 only fails with clang, that means built with gcc:

```
        CC         smm/southbridge/intel/i82801ix/smihandler.o
    /usr/bin/ld: relocatable linking with relocations from format elf32-i386 (/cb-build/coreboot-gerrit.0/clang/EMULATION_QEMU_X86_Q35/smm/mainboard/emulation/qemu-q35/static.o) to format elf64-x86-64 (/cb-build/coreboot-gerrit.0/clang/EMULATION_QEMU_X86_Q35/smm/smm.o) is not supported
    clang-15: error: linker command failed with exit code 1 (use -v to see invocation)

With gcc boards failed with:

CC         ramstage/mainboard/kontron/ktqm77/acpi_tables.o
    make[2]: *** No rule to make target '/cb-build/coreboot-gerrit.0/gcc/KONTRON_KTQM77/libgnat-x86_32/libgnat.a', needed by '/cb-build/coreboot-gerrit.0/gcc/KONTRON_KTQM77/ramstage/mainboard/kontron/ktqm77/gma-mainboard.o'.  Stop.