tests: skip run-deleted.sh when dwfl_linux_proc_attach is not implemented

If the current OS does not implement dwfl_linux_proc_attach (which
currently only Linux does) then skip this test, as "stack" uses that
API for attaching to a running process.

Signed-off-by: Pino Toscano <toscano.pino@tiscali.it>
diff --git a/tests/ChangeLog b/tests/ChangeLog
index 3e567b3..90b9a0a 100644
--- a/tests/ChangeLog
+++ b/tests/ChangeLog
@@ -1,5 +1,10 @@
 2015-06-27  Pino Toscano  <toscano.pino@tiscali.it>
 
+	* tests/run-deleted.sh: Skip when detecting a not implemented
+	dwfl_linux_proc_attach.
+
+2015-06-27  Pino Toscano  <toscano.pino@tiscali.it>
+
 	* tests/dwfl-bug-fd-leak.c (elfutils_open): Check for null results of
 	dwfl_addrmodule.