xdp-tools: fix compilation when bpftool is installed

Currently, xdp-tools doesn't compile on build systems where
bpftool is installed because additional tools and BPF programs
will be compiled then, which results in build errors.

This commit disables the compilation of those bpftool-dependent tools.

Signed-off-by: Til Kaiser <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/16787
Signed-off-by: Robert Marko <[email protected]>

package/network/utils/xdp-tools/Makefile

@@ -87,7 +87,8 @@ CONFIGURE_VARS += \
 	CLANG="$(CLANG)" \
 	BPF_TARGET="$(BPF_ARCH)-linux-gnu" \
 	LLC="$(LLVM_LLC)" \
-	BPF_LDFLAGS="-march=$(BPF_TARGET) -mcpu=v3"
+	BPF_LDFLAGS="-march=$(BPF_TARGET) -mcpu=v3" \
+	BPFTOOL=""
 
 ifneq ($(findstring s,$(OPENWRT_VERBOSE)),)
 	MAKE_FLAGS+=V=1