Fortran: Dead-function removal in error.cc (shrinking by 40%)

Fortran: Dead-function removal in error.cc (shrinking by 40%)

This patch removes a large number of unused static functions from error.cc,
which previously were used for diagnostic but have been replaced by the common
diagnostic code.

gcc/fortran/ChangeLog:

	* error.cc (error_char, error_string, error_uinteger, error_integer,
	error_hwuint, error_hwint, gfc_widechar_display_length,
	gfc_wide_display_length, error_printf, show_locus, show_loci):
	Remove unused static functions.
	(IBUF_LEN, MAX_ARGS): Remove now unused #define.