libbacktrace: check for objcopy --add-gnu-debuglink using --help

	* configure.ac: Check for objcopy --add-gnu-debuglink by using
	objcopy --help.
	* configure: Regenerate

Author: ianlancetaylor

configure

@@ -12891,8 +12891,7 @@ else
   libbacktrace_cv_objcopy_debuglink=no
 elif ! test -n "${OBJCOPY}"; then
   libbacktrace_cv_objcopy_debuglink=no
-elif ${OBJCOPY} --add-gnu-debuglink=x /bin/ls /tmp/ls$$; then
-  rm -f /tmp/ls$$
+elif ${OBJCOPY} --help | fgrep add-gnu-debuglink >/dev/null 2>&1; then
   libbacktrace_cv_objcopy_debuglink=yes
 else
   libbacktrace_cv_objcopy_debuglink=no

configure.ac

@@ -496,8 +496,7 @@ AC_CACHE_CHECK([whether objcopy supports debuglink],
   libbacktrace_cv_objcopy_debuglink=no
 elif ! test -n "${OBJCOPY}"; then
   libbacktrace_cv_objcopy_debuglink=no
-elif ${OBJCOPY} --add-gnu-debuglink=x /bin/ls /tmp/ls$$; then
-  rm -f /tmp/ls$$
+elif ${OBJCOPY} --help | fgrep add-gnu-debuglink >/dev/null 2>&1; then
   libbacktrace_cv_objcopy_debuglink=yes
 else
   libbacktrace_cv_objcopy_debuglink=no