Fix comsat testsuite.

* comsat/tests/atlocal.in (MH_SUPPORT)
(MAILDIR_SUPPORT): New variables.
* comsat/tests/testsuite.at: Disable test cases if their
prerequisite features are not compiled in.

@@ -3,4 +3,6 @@
 # Copyright (C) 2004, 2010-2012 Free Software Foundation, Inc.
 
 PATH=@abs_builddir@:@abs_top_builddir@/comsat:$top_srcdir:$srcdir:$PATH
+@MU_COND_SUPPORT_MH_TRUE@MH_SUPPORT=yes
+@MU_COND_SUPPORT_MAILDIR_TRUE@MAILDIR_SUPPORT=yes
   

@@ -103,7 +103,8 @@ EOT
 chmod 600 biff.rc
 > $cwd/output
 ],
-[comsatcmd maildir:$cwd/mailbox new/1284627340.M364969P3770Q81.Trurl
+[test "$MAILDIR_SUPPORT" = yes || AT_SKIP_TEST
+comsatcmd maildir:$cwd/mailbox new/1284627340.M364969P3770Q81.Trurl
 sed '1s/^Mail to .*/Mail to test user/' output
 ],
 [Mail to test user
@@ -127,7 +128,8 @@ EOT
 chmod 600 biff.rc
 > $cwd/output
 ],
-[comsatcmd mh:$cwd/mailbox teaparty/58
+[test "$MH_SUPPORT" = yes || AT_SKIP_TEST
+comsatcmd mh:$cwd/mailbox teaparty/58
 sed '1s/^Mail to .*/Mail to test user/' output
 ],
 [Mail to test user