examples/c: Add support for arm64

Add arm64 vmlinux.h header. Update Makefile to select
vmlinux.h by arch. The vmlinux/vmlinux.h is kept so that
this change won't break Rust and Xmake build.

Signed-off-by: Hengqi Chen <chenhengqi@outlook.com>

examples/c/Makefile

@@ -5,13 +5,13 @@ LLVM_STRIP ?= llvm-strip
 BPFTOOL ?= $(abspath ../../tools/bpftool)
 LIBBPF_SRC := $(abspath ../../libbpf/src)
 LIBBPF_OBJ := $(abspath $(OUTPUT)/libbpf.a)
-VMLINUX := ../../vmlinux/vmlinux.h
+ARCH := $(shell uname -m | sed 's/x86_64/x86/' | sed 's/aarch64/arm64/' | sed 's/ppc64le/powerpc/' | sed 's/mips.*/mips/')
+VMLINUX := ../../vmlinux/$(ARCH)/vmlinux.h
 # Use our own libbpf API headers and Linux UAPI headers distributed with
 # libbpf to avoid dependency on system-wide headers, which could be missing or
 # outdated
 INCLUDES := -I$(OUTPUT) -I../../libbpf/include/uapi -I$(dir $(VMLINUX))
 CFLAGS := -g -Wall
-ARCH := $(shell uname -m | sed 's/x86_64/x86/' | sed 's/aarch64/arm64/' | sed 's/ppc64le/powerpc/' | sed 's/mips.*/mips/')
 
 APPS = minimal bootstrap uprobe kprobe fentry
 

vmlinux/arm64/vmlinux.h

@@ -0,0 +1 @@
+vmlinux_516.h