libgo: Update from Go 1.5 to Go 1.5.1.

Reviewed-on: https://go-review.googlesource.com/16527

From-SVN: r229624

libgo/go/fmt/scan.go

@@ -83,6 +83,8 @@ func Scanln(a ...interface{}) (n int, err error) {
 // the format.  It returns the number of items successfully scanned.
 // If that is less than the number of arguments, err will report why.
 // Newlines in the input must match newlines in the format.
+// The one exception: the verb %c always scans the next rune in the
+// input, even if it is a space (or tab etc.) or newline.
 func Scanf(format string, a ...interface{}) (n int, err error) {
 	return Fscanf(os.Stdin, format, a...)
 }
@@ -1164,15 +1166,18 @@ func (s *ss) doScanf(format string, a []interface{}) (numProcessed int, err erro
 		if !widPresent {
 			s.maxWid = hugeWid
 		}
-		s.SkipSpace()
+
+		c, w := utf8.DecodeRuneInString(format[i:])
+		i += w
+
+		if c != 'c' {
+			s.SkipSpace()
+		}
 		s.argLimit = s.limit
 		if f := s.count + s.maxWid; f < s.argLimit {
 			s.argLimit = f
 		}
 
-		c, w := utf8.DecodeRuneInString(format[i:])
-		i += w
-
 		if numProcessed >= len(a) { // out of operands
 			s.errorString("too few operands for format %" + format[i-w:])
 			break