lttng-libust: needs autoreconf

The recently introduced
0002-doc-examples-Makefile.am-define-C-and-C-compilers-fo.patch touches
Makefile.am, so lttng-libust needs to be autoreconfed.

Fixes:

  http://autobuild.buildroot.net/results/e917552ea1069da74c4e392556914d05c010a250/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/lttng-libust/lttng-libust.mk

@@ -12,6 +12,8 @@ LTTNG_LIBUST_LICENSE_FILES = COPYING
 LTTNG_LIBUST_INSTALL_STAGING = YES
 LTTNG_LIBUST_DEPENDENCIES = liburcu util-linux
 LTTNG_LIBUST_CONF_OPTS += --disable-man-pages
+# 0002-doc-examples-Makefile.am-define-C-and-C-compilers-fo.patch
+LTTNG_LIBUST_AUTORECONF = YES
 
 ifeq ($(BR2_PACKAGE_PYTHON),y)
 LTTNG_LIBUST_DEPENDENCIES += python