[patch] handle core file names without a pid suffix

[Matthias Klose]

The following fix is needed when /proc/sys/kernel/core_uses_pid is set to 0. try
to rename the core file, and if it does still fail, skip the test.

  Matthias

--- elfutils-0.158.orig/tests/backtrace-subr.sh
+++ elfutils-0.158/tests/backtrace-subr.sh
@@ -111,6 +111,11 @@ check_native_core()

   # Skip the test if we cannot adjust core ulimit.
   core="core.`ulimit -c unlimited || exit 77; set +ex; testrun
${abs_builddir}/$child --gencore; true`"
+  # see if /proc/sys/kernel/core_uses_pid is set to 0
+  if [ -f core ]; then
+    mv core "$core"
+  fi
+  if [ ! -f "$core" ]; then exit 77; fi

   if [ "x$SAVED_VALGRIND_CMD" != "x" ]; then
     VALGRIND_CMD="$SAVED_VALGRIND_CMD"