A simple replacement of sprintf (xxx, "%s", xxx) with strcpy.

	* config/tc-score7.c: Replace sprintf with strcpy where
	appropriate.
Fix seg-faults when fetching the frags of local symbols.

	* config/tc-score7.c: (s7_b32_relax_to_b16): Use symbol_get_frag() to access a symbol's frag.
	* config/tc-score.c (s3_relax_branch_inst16): Likewise.
	(s3_relax_cmpbranch_inst32): Likewise.