lib/50937: incorrect printf result for subnormal long double values

[sibnick%gmail.com@localhost]

>Number:         50937
>Category:       lib
>Synopsis:       incorrect printf result for subnormal long double values
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Mar 11 03:10:00 +0000 2016
>Originator:     Tolstokulakov Nikolay
>Release:        7.0
>Organization:
nsu.ru
>Environment:
NetBSD netbsd.home 7.0 NetBSD 7.0 (GENERIC.201509250726Z) amd64
>Description:
Unexpected and wrong result when print subnormal long double value

SO question & answer http://stackoverflow.com/questions/35090322/netbsd-long-double-trouble
>How-To-Repeat:
 #include <stdio.h>

 int main()
 {
      long double rd = 3.3621e-4932L;
      printf("%Le\n", rd);
      // NetBSD prints 1.681050e-4932
      return 0;
 }
>Fix: