package/lttng-tools: bump to version 2.13.8

This bump will fix the following build failure without NPTL thanks to
https://github.com/lttng/lttng-tools/commit/27f2b8400c9db484cd195c4240c379e845b1413d
which is raised since bump to version 2.13.2 in commit
8e5f2d0f8e8c04e98f8761f3cba683c56bbefc8c and
https://github.com/lttng/lttng-tools/commit/014d7d3b5e9d69989bf776cffb6c21ff7e1d36ff:

In file included from thread.c:10:
../../src/common/compat/pthread.h: In function 'lttng_pthread_setname_np':
../../src/common/compat/pthread.h:63:27: error: 'LTTNG_UST_ABI_PROCNAME_LEN' undeclared (first use in this function)
   63 |         if (strnlen(name, LTTNG_UST_ABI_PROCNAME_LEN) >= LTTNG_UST_ABI_PROCNAME_LEN) {
      |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~

https://github.com/lttng/lttng-tools/blob/v2.13.8/ChangeLog

Fixes:
 - http://autobuild.buildroot.org/results/bbc8d6621822bb5da7513331e69799ca25a03f66

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 2d94e7a6214c3bbf9add65e7ab29b530d2d57b70)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/lttng-tools/lttng-tools.hash

@@ -1,5 +1,5 @@
-# From https://lttng.org/files/lttng-tools/lttng-tools-2.13.2.tar.bz2.sha256
-sha256  ced2ba00020da77fd17ac92b5a53825502409a07e3aeca28f9515d4a844fd7bd  lttng-tools-2.13.2.tar.bz2
+# From https://lttng.org/files/lttng-tools/lttng-tools-2.13.8.tar.bz2.sha256
+sha256  b1e959579b260790930b20f3c7aa7cefb8a40e0de80d4a777c2bf78c6b353dc1  lttng-tools-2.13.8.tar.bz2
 
 # Locally computed
 sha256  068e55c7dbe597400199aee75ac5e71bdb2ca88c4c9a4cfa8e1fbc61f933eda5  LICENSE

package/lttng-tools/lttng-tools.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LTTNG_TOOLS_VERSION = 2.13.2
+LTTNG_TOOLS_VERSION = 2.13.8
 LTTNG_TOOLS_SITE = https://lttng.org/files/lttng-tools
 LTTNG_TOOLS_SOURCE = lttng-tools-$(LTTNG_TOOLS_VERSION).tar.bz2
 LTTNG_TOOLS_INSTALL_STAGING = YES