docs/build: Do not open-code $*

Sometimes there is already a round enough wheel to hand.

No functional change.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
CC: Ian Campbell <Ian.Campbell@citrix.com>
CC: Ian Jackson <Ian.Jackson@eu.citrix.com>
CC: Wei Liu <wei.liu2@citrix.com>
Acked-by: Ian Campbell <Ian.Campbell@citrix.com>

docs/Makefile

@@ -73,13 +73,11 @@ endif
 
 man1/%.1: man/%.pod.1 Makefile
 	$(INSTALL_DIR) $(@D)
-	$(POD2MAN) --release=$(VERSION) --name=`echo $@ | sed 's/^man1.//'| \
-		sed 's/.1//'` -s 1 -c "Xen" $< $@
+	$(POD2MAN) --release=$(VERSION) --name=$* -s 1 -c "Xen" $< $@
 
 man5/%.5: man/%.pod.5 Makefile
 	$(INSTALL_DIR) $(@D)
-	$(POD2MAN) --release=$(VERSION) --name=`echo $@ | sed 's/^man5.//'| \
-		sed 's/.5//'` -s 5 -c "Xen" $< $@
+	$(POD2MAN) --release=$(VERSION) --name=$* -s 5 -c "Xen" $< $@
 
 .PHONY: clean
 clean: