doc: the man page for "wmsetbg" is now processed by a script

Because the tool's help page changes whether Xinerama support was compiled
or not, its man page have to reflect this, so instead of being simply
copied the file is processed with the 'replace-ac-keywords' script.

Signed-off-by: Christophe CURIS <christophe.curis@free.fr>

doc/Makefile.am

@@ -17,17 +17,17 @@ dist_man_MANS = \
 	wmagnify.1x \
 	wmgenmenu.1 \
 	wmmenugen.1 \
-	wmsetbg.1x \
 	WPrefs.1x \
 	wxcopy.1x \
 	wxpaste.1x
 
 man_MANS = \
-	wmaker.1x
+	wmaker.1x \
+	wmsetbg.1x
 
-MOSTLYCLEANFILES = wmaker.1x
+MOSTLYCLEANFILES = wmaker.1x wmsetbg.1x
 
-EXTRA_DIST = wmaker.in
+EXTRA_DIST = wmaker.in wmsetbg.in
 
 wmaker.1x: wmaker.in Makefile $(top_builddir)/config.h
 	$(AM_V_GEN)$(top_srcdir)/script/replace-ac-keywords.sh \
@@ -36,6 +36,11 @@ wmaker.1x: wmaker.in Makefile $(top_builddir)/config.h
 		-D"pkgdatadir=$(pkgdatadir)" --replace "pkgdatadir" \
 		-o "wmaker.1x"  "$(srcdir)/wmaker.in"
 
+wmsetbg.1x: wmsetbg.in Makefile $(top_builddir)/config.h
+	$(AM_V_GEN)$(top_srcdir)/script/replace-ac-keywords.sh \
+		--header "$(top_builddir)/config.h" --filter "USE_XINERAMA" \
+		-o "wmsetbg.1x"  "$(srcdir)/wmsetbg.in"
+
 # Create a 'silent rule' for our make check the same way automake does
 AM_V_CHKOPTS = $(am__v_CHKOPTS_$(V))
 am__v_CHKOPTS_  = $(am__v_CHKOPTS_$(AM_DEFAULT_VERBOSITY))
@@ -87,7 +92,7 @@ wmgenmenu-args:
 
 wmsetbg-args:
 	$(AM_V_CHKOPTS)$(top_srcdir)/script/check-cmdline-options-doc.sh \
-		--program "$(top_builddir)/util/wmsetbg" --man-page "$(top_srcdir)/doc/wmsetbg.1x"
+		--program "$(top_builddir)/util/wmsetbg" --man-page "wmsetbg.1x"
 
 wxcopy-args:
 	$(AM_V_CHKOPTS)$(top_srcdir)/script/check-cmdline-options-doc.sh \