For PR 4865.

For PR 4865.
	* libecoff.h (struct ecoff_link_hash_entry): Change type of
	written from boolean to char.  Add new field small.
	* ecoff.c (ecoff_link_hash_newfunc): Initialize written to 0
	rather than false.  Initialize small to 0.
	(ecoff_link_add_externals): If ECOFF type is scSUndefined, set
	small.  If small is set, and hash table type is common, force the
	symbol into a section named SCOMMON and change the ECOFF type from
	scCommon to scSCommon.
	(ecoff_link_write_external): Set written to 1 rather than true.
	* coff-mips.c (mips_relocate_section): Correct JMPADDR reloc
	overflow check to consider section VMA of input file.