format dashes as dashes so as to not confuse people

groff 1.23.0 also changed the "utf8" device to render
"^" and "~" as U+02C6 and U+02DC respectively.
this causes similar searchability/copy-paste issue
especially for ~ which is often used to denote $HOME path.

http://bugs.gentoo.org/16108
http://bugs.gentoo.org/17580
http://bugs.gentoo.org/121502

--- a/tmac/man.local
+++ b/tmac/man.local
@@ -1,6 +1,12 @@
 .\" This file is loaded by an.tmac.
 .\"
 .\" Put local modifications to groff_man(7)'s behavior here.
+.if '\*[.T]'utf8' \{\
+.  char \- \N'45'
+.  char  - \N'45'
+.  char ^ \[ha]
+.  char ~ \[ti]
+.\}
 .\"
 .\" Change "0" to "1" to enable OSC 8 links on SGR-capable grotty(1)
 .\" output devices.
--- a/tmac/mdoc.local
+++ b/tmac/mdoc.local
@@ -1,6 +1,12 @@
 .\" This file is loaded by mdoc.tmac.
 .\"
 .\" Put local modifications to groff_mdoc(7)'s behavior here.
+.if '\*[.T]'utf8' \{\
+.  char \- \N'45'
+.  char  - \N'45'
+.  char ^ \[ha]
+.  char ~ \[ti]
+.\}
 .\"
 .\" "CW" is not a portable font name, but some man pages use it anyway.
 .\" Uncomment this to suppress warnings produced by such pages.  This