lttng-tools: Install to staging

Install the LTTng control library headers and shared objects
to staging.

The C interface to LTTng described here:
https://lttng.org/docs/v2.10/#doc-liblttng-ctl-lttng
requires including <lttng/lttng.h> and linking against liblttng-ctl,
but those parts are not available unless this package does a staging
install.

Signed-off-by: John Faith <jfaith@impinj.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 3466298b0fa334e66050fede0629ad0f35baf21e)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/lttng-tools/lttng-tools.mk

@@ -7,6 +7,7 @@
 LTTNG_TOOLS_VERSION = 2.10.1
 LTTNG_TOOLS_SITE = http://lttng.org/files/lttng-tools
 LTTNG_TOOLS_SOURCE = lttng-tools-$(LTTNG_TOOLS_VERSION).tar.bz2
+LTTNG_TOOLS_INSTALL_STAGING = YES
 LTTNG_TOOLS_LICENSE = GPL-2.0+, LGPL-2.1+ (include/lttng/*, src/lib/lttng-ctl/*)
 LTTNG_TOOLS_LICENSE_FILES = gpl-2.0.txt lgpl-2.1.txt LICENSE
 LTTNG_TOOLS_CONF_OPTS += --disable-man-pages