Fix the evaluation of RL78 complex relocs, by making immediate values be computed...

Fix the evaluation of RL78 complex relocs, by making immediate values be computed relative to a new absolute symbol.

gas	* config/tc-rl78.c (rl78_abs_sym): New local variable.
	(md_begin): Initialise the new symbol.
	(OPIMM): Define the value to be relative to the new symbol and not
	the absolute section symbol.

ld	* emulparams/elf32rl78.sh (OTHER_SECTIONS): Provide a value for
	the _-rl78_abs__ symbol.

tests	* gas/all/struct.d: Allow for extra symbols in the output.
	* gas/macros/test1.d: Likewise.
	* gas/elf/elf.exp: Add an rl78 machine.
	* gas/elf/sections2e-rl78: New file.

tests	* binutils-all/localize-hidden-1.d: Allow for extra symbols in the
	output.
        * binutils-all/strip-11.d: Skip for the RL78.