check-expandargv randomly succeeds or fails w/o a reason.

--- libiberty/testsuite/Makefile.in.orig	Tue Nov 30 12:51:50 2010
+++ libiberty/testsuite/Makefile.in	Tue Nov 30 12:52:01 2010
@@ -45,7 +45,7 @@ all:
 # CHECK is set to "really_check" or the empty string by configure.
 check: @CHECK@
 
-really-check: check-cplus-dem check-pexecute check-expandargv
+really-check: check-cplus-dem check-pexecute
 
 # Run some tests of the demangler.
 check-cplus-dem: test-demangle $(srcdir)/demangle-expected