include arch specifics

Signed-off-by: Peng Fan <van.freenix@gmail.com>
Fixed layout problem

Fixed when only one elf object file is passed to rtems-ld.And fixed the error when
one object file has rela relocation records, but the other does not contain relocation
records.
Fixed fsec

If one object file contains .rodata and .rodata.str1.4 sections,
.rodata contains rela reloc entries, but .rodata.str1.4 do not
contain reloc entris.'.rodata' and '.rodata.str1.4' will be both
included in '.const'.Then using this patch to fix the rela problem
Fixed the reloc entry order for mips

Signed-off-by: Peng Fan <van.freenix@gmail.com>
Add support for relocations which reference local symbols