selftests/bpf: Fix missing BUILD_BUG_ON() declaration

BugLink: https://bugs.launchpad.net/bugs/2089340

[ Upstream commit 6495eb79ca7d15bd87c38d77307e8f9b6b7bf4ef ]

Explicitly include '<linux/build_bug.h>' to fix errors seen compiling with
gcc targeting mips64el/musl-libc:

  user_ringbuf.c: In function 'test_user_ringbuf_loop':
  user_ringbuf.c:426:9: error: implicit declaration of function 'BUILD_BUG_ON' [-Werror=implicit-function-declaration]
    426 |         BUILD_BUG_ON(total_samples <= c_max_entries);
        |         ^~~~~~~~~~~~
  cc1: all warnings being treated as errors

Fixes: e5a9df51c7 ("selftests/bpf: Add selftests validating the user ringbuf")
Signed-off-by: Tony Ambardar <tony.ambardar@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/b28575f9221ec54871c46a2e87612bb4bbf46ccd.1721713597.git.tony.ambardar@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Portia Stephens <portia.stephens@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

tools/testing/selftests/bpf/prog_tests/user_ringbuf.c

@@ -4,6 +4,7 @@
 #define _GNU_SOURCE
 #include <linux/compiler.h>
 #include <linux/ring_buffer.h>
+#include <linux/build_bug.h>
 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>