git: changed to build html and man pages if 'asciidoc' and 'xmlto' packages are effectively installed

develop/git/git.conf

@@ -24,11 +24,11 @@ var_append makeopt ' ' 'gitweb'
 var_append makeinstopt ' ' 'gitwebdir=$root$docdir/gitweb'
 var_append makeinstopt ' ' 'install-gitweb'
 
-if pkginstalled asciidoc; then
+if pkginstalled -f asciidoc; then
 	var_append makeopt ' ' 'html'
 	var_append makeinstopt ' ' 'install-html'
 	# build/install man pages
-	if pkginstalled xmlto; then
+	if pkginstalled -f xmlto; then
 		var_append makeopt ' ' 'man'
 		var_append makeinstopt ' ' 'install-man'
 	fi