bpftool: Remove llvm-strip from Makefile

As Quentin and Andrri said [0], bpftool gen object strips
out DWARF already, so remove the repeat operation.

[0] libbpf/bpftool#161

Suggested-by: Andrii Nakryiko <andrii@kernel.org>
Suggested-by: Quentin Monnet <qmo@kernel.org>
Signed-off-by: Tao Chen <chen.dylane@gmail.com>
Acked-by: Quentin Monnet <qmo@kernel.org>

tools/bpf/bpftool/Makefile

@@ -219,7 +219,6 @@ $(OUTPUT)%.bpf.o: skeleton/%.bpf.c $(OUTPUT)vmlinux.h $(LIBBPF_BOOTSTRAP)
 		-I$(LIBBPF_BOOTSTRAP_INCLUDE) \
 		-g -O2 -Wall -fno-stack-protector \
 		--target=bpf -c $< -o $@
-	$(Q)$(LLVM_STRIP) -g $@
 
 $(OUTPUT)%.skel.h: $(OUTPUT)%.bpf.o $(BPFTOOL_BOOTSTRAP)
 	$(QUIET_GEN)$(BPFTOOL_BOOTSTRAP) gen skeleton $< > $@