build: fix for text documentation generation

Fix the date/version tags in the man pages also.

Signed-off-by: Kevin Shanahan <kmshanah@disenchant.net>

Makefile

@@ -213,6 +213,7 @@ quiet_cmd_man2txt = '  MAN2TXT  $@'
       cmd_man2txt = \
 	$(GROFF) -man -Tascii $< | cat -v | \
 	sed -e 's/\^\[\[\([0-9]\)\{1,2\}[a-z]//g' \
+	    -e 's/.\^H//g' \
 	    -e 's/$$/'`printf \\\r`'/' > $(@D)/.$(@F).tmp && \
 	mv $(@D)/.$(@F).tmp $@
 

man/light.1

@@ -1,7 +1,7 @@
 .\" Process this file with
 .\" groff -man -Tascii light.1
 .\"
-.TH LIGHT 1 "MARCH 2013" TYRUTILS
+.TH LIGHT 1 "TYR_VERSION" TYRUTILS
 
 .SH NAME
 light \- Caclulate lightmap data for a Quake BSP file

man/qbsp.1

@@ -1,7 +1,7 @@
 .\" Process this file with
 .\" groff -man -Tascii qbsp.1
 .\"
-.TH QBSP 1 "MARCH 2013" TYRUTILS
+.TH QBSP 1 "TYR_VERSION" TYRUTILS
 
 .SH NAME
 qbsp \- Compile a Quake BSP file from a MAP source file

man/vis.1

@@ -1,7 +1,7 @@
 .\" Process this file with
 .\" groff -man -Tascii qbsp.1
 .\"
-.TH VIS 1 "MARCH 2013" TYRUTILS
+.TH VIS 1 "TYR_VERSION" TYRUTILS
 
 .SH NAME
 vis \- Compute visibility (PVS) for a Quake BSP file