More autotools cleanup

- Don't build msproxy if unused
- Add resources to cleanfiles
- Remove old extra_dist from plugins

plugins/Makefile.am

@@ -1,8 +1,3 @@
-# temp. solution while mailcheck & xdcc arn't in SUBDIRS
-EXTRA_DIST = Make.plugin plugin-conf.in xdcc/xdcc.c xdcc/Makefile.am
-
-# noinst_HEADERS = hexchat-plugin.h
-
 if DO_PYTHON
 pythondir = python
 endif
@@ -27,5 +22,4 @@ if DO_SYSINFO
 sysinfodir = sysinfo
 endif
 
-#SUBDIRS = . $(pythondir) $(perldir) mailcheck xdcc
-SUBDIRS = . $(pythondir) $(perldir) $(checksumdir) $(doatdir) $(fishlimdir) $(sysinfodir)
+SUBDIRS = $(pythondir) $(perldir) $(checksumdir) $(doatdir) $(fishlimdir) $(sysinfodir)