rtla: Fix build without libbpf header

rtla supports building without libbpf. However, BPF actions
patchset [1] adds an include of bpf/libbpf.h into timerlat_bpf.h,
which breaks build on systems that don't have libbpf headers
installed.

This is a leftover from a draft version of the patchset where
timerlat_bpf_set_action() (which takes a struct bpf_program * argument)
was defined in the header. timerlat_bpf.c already includes bpf/libbpf.h
via timerlat.skel.h when libbpf is present.

Remove the redundant include to fix build on systems without libbpf
headers.

[1] https://lore.kernel.org/linux-trace-kernel/[email protected]/T/

Cc: John Kacur <[email protected]>
Cc: Luis Goncalves <[email protected]>
Cc: Crystal Wood <[email protected]>
Cc: Costa Shulyupin <[email protected]>
Link: https://patch.msgid.link/[email protected]
Reported-by: Steven Rostedt (Google) <[email protected]>
Closes: https://lore.kernel.org/linux-trace-kernel/20260329122202.65a8b575@robin/
Fixes: 8cd0f08 ("rtla/timerlat: Support tail call from BPF program")
Signed-off-by: Tomas Glozar <[email protected]>
Reviewed-by: Wander Lairson Costa <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>

Author: lenticularis39

tools/tracing/rtla/src/timerlat_bpf.h

@@ -12,7 +12,6 @@ enum summary_field {
 };
 
 #ifndef __bpf__
-#include <bpf/libbpf.h>
 #ifdef HAVE_BPF_SKEL
 int timerlat_bpf_init(struct timerlat_params *params);
 int timerlat_bpf_attach(void);