[Users] Fix for latest git to allow it to build

[Brian Morrison]

Small problem with latest git change, easy fix follows:

--- src/plugins/archive/Makefile.am	2018-07-13
19:12:03.503629183 +0100 +++ src/plugins/archive/Makefile.am.new
2018-07-13 19:11:26.081229908 +0100 @@ -13,8 +13,10 @@
 	      libarchive_archive.c \
 		  libarchive_archive.h \
 		  archiver.c \
+		  archiver.h \
 		  archiver_gtk.c \
-		  archiver_prefs.c
+		  archiver_prefs.c \
+		  archiver_prefs.h
 
 archive_la_LDFLAGS = \
 		-avoid-version -module \


-- 

Brian Morrison