[Bug-tar] Fix for m4/sysexits.m4 in tar 1.15.1

[Todd Vierling]

The sysexits.h replacement override logic is backwards.  It should be
setting SYSEXITS_H to empty if sysexits.h does exist (because SYSEXITS_H is
used to create a make target that will copy in a replacement).

--- m4/sysexits.m4.orig 2005-01-21 10:46:35.000000000 -0500
+++ m4/sysexits.m4      2005-01-21 10:46:49.000000000 -0500
@@ -9,7 +9,7 @@
 AC_DEFUN([gl_SYSEXITS],
 [
   AC_CHECK_HEADERS(sysexits.h,
-    [SYSEXITS_H=sysexits.h],
-    [SYSEXITS_H=])
+    [SYSEXITS_H=],
+    [SYSEXITS_H=sysexits.h])
   AC_SUBST([SYSEXITS_H])
 ])

-- 
-- Todd Vierling <address@hidden> <address@hidden>