(build_bytes): Mark fixups for PCrel branches as signed. For
OBJ_ELF, make sure the reloc's offset points to the first byte
to be modified.
(md_convert_frag): Update definiton based on BFD_ASSEMBLER.
* tc-h8300.h (relocation mappings): Add.
* tc-h8300.c (tc_crawl_symbol_chain, tc_headers_hook): Don't
define for BFD_ASSEMBLER.
(tc_reloc_mangle): Likewise.
(tc_gen_reloc): New function for BFD_ASSEMBLER.
More of Joern's patches with minor changes s/OBJ_ELF/BFD_ASSEMBLER/
assorted coff relocations to the corresponding elf relocations.
* tc-h8300.h (TARGET_ARCH, TARGET_FORMAT): Define appropriately.
More of Joern's patches.