re PR c/79837 (incomplete diagnostic in c-parser: expected +, *, -, &, ^, |, &&, ||, min or identifier)

	PR c/79837
	* c-parser.c (c_parser_omp_clause_reduction): Don't mention
	%<min%> or %<max%> in the diagnostics, instead mention identifier.
	(c_parser_omp_declare_reduction): Don't mention %<min%> in the
	diagnostics.

From-SVN: r245885