Log Message:
Updated mandoc to 1.14.3.

Changes in version 1.14.3, released on August 5, 2017

    --- BUG FIXES ---
 * man(7): Do not crash with out-of-bounds read access to a constant
   array if .sp or a blank line immediately precedes .SS or .SH.
 * mdoc(7): Do not crash with out-of-bounds read access to a constant
   array if .sp or a blank line precede the first .Sh macro.
 * tbl(7): Ignore explicitly specified negative column widths rather than
   wrapping around to huge numbers and risking memory exhaustion.
 * man(1): No longer use names that only occur in the SYNOPSIS section.
   Gets rid of some surprising behaviour and bogus warnings.
    --- THANKS TO ---
   Leah Neukirchen (Void Linux), Markus Waldeck (Debian),
   Peter Bui (nd.edu), and Yuri Pankov (illumos) for bug reports.