fix %lf, etc. with printf

the l prefix is redundant/no-op with printf, since default promotions
always promote floats to double; however, it is valid, and printf was
wrongly rejecting it.

src/stdio/vfprintf.c

@@ -73,6 +73,8 @@ static const unsigned char states[]['z'-'A'+1] = {
 	}, { /* 1: l-prefixed */
 		S('d') = LONG, S('i') = LONG,
 		S('o') = ULONG, S('u') = ULONG, S('x') = ULONG, S('X') = ULONG,
+		S('e') = DBL, S('f') = DBL, S('g') = DBL, S('a') = DBL,
+		S('E') = DBL, S('F') = DBL, S('G') = DBL, S('A') = DBL,
 		S('c') = INT, S('s') = PTR, S('n') = PTR,
 		S('l') = LLPRE,
 	}, { /* 2: ll-prefixed */