libpcap: Compile with clang

Signed-off-by: Leon Hwang <hffilwlqm@gmail.com>

Author: Asphaltt

Makefile

@@ -169,7 +169,7 @@ ifeq ($(UNAME_M),aarch64)
 				 -I ./kern/bpf/arm64
 	 AUTOGENCMD = ls -al kern/bpf/arm64/vmlinux.h
 	 IGNORE_LESS52 = -ignore '.*_less52\.o'
-	 CC = aarch64-linux-gnu-gcc
+	 LIBPCAP_CC = clang
 	 LIBPCAP_ARCH = aarch64-unknown-linux-gnu
 else
 	# x86_64 default
@@ -179,7 +179,7 @@ else
 	BPFHEADER = -I ./kern \
 			    -I ./kern/bpf/x86
 	AUTOGENCMD = test -f kern/bpf/x86/vmlinux.h || $(CMD_BPFTOOL) btf dump file /sys/kernel/btf/vmlinux format c > kern/bpf/x86/vmlinux.h
-	CC = gcc
+	LIBPCAP_CC = clang
 	LIBPCAP_ARCH = x86_64-unknown-linux-gnu
 endif
 
@@ -408,7 +408,7 @@ assets_nocore: \
 
 $(TARGET_LIBPCAP):
 	cd lib/libpcap && \
-		./configure --disable-rdma --disable-shared --disable-usb \
+		CC=$(LIBPCAP_CC) ./configure --disable-rdma --disable-shared --disable-usb \
 			--disable-netmap --disable-bluetooth --disable-dbus --without-libnl \
 			--without-dpdk --without-dag --without-septel --without-snf \
 			--without-turbocap --host=$(LIBPCAP_ARCH) && \