pe/coff - add support for base64 encoded long section names

  PR 30444
  * coffcode.h (coff_write_object_contents): Handle base64 encoding on PE.  Also check for too large string table.
  * coffgen.c (extract_long_section_name): New function extracted from ... (make_a_section_from_file): ... here.  Add support for base64 long section names. (decode_base64): New function.