tests: gen-ust-events-ns/tp.h: Fix build with musl libc

tests: gen-ust-events-ns/tp.h: Fix build with musl libc

Fix the following build error with musl libc:
In file included from ../../../../../lttng-tools-2.12.0/tests/utils/testapp/gen-ust-events-ns/tp.h:14,
                 from ../../../../../lttng-tools-2.12.0/tests/utils/testapp/gen-ust-events-ns/tp.c:10:
../../../../../lttng-tools-2.12.0/tests/utils/testapp/gen-ust-events-ns/tp.h:17:10: error: unknown type name 'ino_t'; did you mean 'int8_t'?
   17 |  TP_ARGS(ino_t, ns_ino),
      |          ^~~~~
../../../../../lttng-tools-2.12.0/tests/utils/testapp/gen-ust-events-ns/tp.h:17:10: error: unknown type name 'ino_t'; did you mean 'int8_t'?
   17 |  TP_ARGS(ino_t, ns_ino),
      |          ^~~~~
../../../../../lttng-tools-2.12.0/tests/utils/testapp/gen-ust-events-ns/./tp.h:17:2: error: unknown type name 'ino_t'; did you mean 'int8_t'?
   17 |  TP_ARGS(ino_t, ns_ino),
      |  ^~~~~~~
../../../../../lttng-tools-2.12.0/tests/utils/testapp/gen-ust-events-ns/./tp.h:17:2: error: unknown type name 'ino_t'; did you mean 'int8_t'?
   17 |  TP_ARGS(ino_t, ns_ino),
      |  ^~~~~~~

Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Ic7a73c6754fc30a62bdf6519062c07be65a2eaba