rtems-ld created wrong RAP file on arm

Original author: jameszxj

I use the latest rtems-tools to generate RAP file, I found the object file become too small(elf,2184bytes==>rap,736bytes) and the file loaded failed, error message like this:

load app.out error:offset past end of file: offset=736 size=736 error.

I reverted the rtl-rap.cpp commit (0ad4aaaf).

At Chris's suggestion, I found get_relocations(s) return all the count of relocation and write to rap file, but actual count is less, because ignore the reloc with section=0.

I tried to make the length fit the relocs write to rap file, the file can not be loaded, it crashed. So the relocs(reloc.symsect == 0) can not be ignored, at least on arm.

The command line I used to create RAP file is:

rtems-ld -n -e appmain -s -O rap --base rtems.elf app.elf -o app.out