[openwrt/openwrt] include/bpf.mk: fix typo in clang version check

[LEDE Commits]

nbd pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/959a0308e5ac3af5a27fc5c401e8e11b5d316c6f

commit 959a0308e5ac3af5a27fc5c401e8e11b5d316c6f
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Fri Nov 12 13:15:35 2021 +0100

    include/bpf.mk: fix typo in clang version check
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 include/bpf.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/bpf.mk b/include/bpf.mk
index 967de7a172..d9f1153cba 100644
--- a/include/bpf.mk
+++ b/include/bpf.mk
@@ -64,7 +64,7 @@ BPF_CFLAGS := \
 	-O2 -emit-llvm -Xclang -disable-llvm-passes
 
 ifeq ($(DUMP),)
-  CLANG_VER:=$(shell clang -dM -E - < /dev/null | grep __clang_major__ | cut -d' ' -f3)
+  CLANG_VER:=$(shell $(CLANG) -dM -E - < /dev/null | grep __clang_major__ | cut -d' ' -f3)
   CLANG_VER_VALID:=$(shell [ "$(CLANG_VER)" -ge "$(CLANG_MIN_VER)" ] && echo 1 )
   ifeq ($(CLANG_VER_VALID),)
     $(error ERROR: LLVM/clang version too old. Minimum required: $(CLANG_MIN_VER), found: $(CLANG_VER))