format dashes as dashes so as to not confuse people

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

--- tmac/man.local
+++ tmac/man.local
@@ -1,2 +1,6 @@
 .\" This file is loaded after an-old.tmac.
 .\" Put any local modifications to an-old.tmac here.
+.if '\*[.T]'utf8' \{\
+.  char \- \N'45'
+.  char  - \N'45'
+.\}
--- tmac/mdoc.local
+++ tmac/mdoc.local
@@ -1,2 +1,6 @@
 .\" This file is loaded after doc.tmac.
 .\" Put any local modifications to doc.tmac here.
+.if '\*[.T]'utf8' \{\
+.  char \- \N'45'
+.  char  - \N'45'
+.\}