[configure.ac] Only use AM_EXTRA_RECURSIVE_TARGETS when available (#1…

…1877)

It's only available in automake 1.13+. Since we only use it for tests
we can just make it optional on systems with earlier automake.

Fixes #11809

configure.ac

@@ -20,8 +20,8 @@ AM_INIT_AUTOMAKE([1.9 dist-bzip2 tar-ustar no-dist-gzip foreign subdir-objects]
 
 AC_CONFIG_HEADERS([config.h])
 AM_MAINTAINER_MODE
-AM_EXTRA_RECURSIVE_TARGETS([test])
-AM_EXTRA_RECURSIVE_TARGETS([test-bundle])
+m4_ifdef([AM_EXTRA_RECURSIVE_TARGETS], AM_EXTRA_RECURSIVE_TARGETS([test]))
+m4_ifdef([AM_EXTRA_RECURSIVE_TARGETS], AM_EXTRA_RECURSIVE_TARGETS([test-bundle]))
 
 API_VER=2.0
 AC_SUBST(API_VER)