[openwrt/openwrt] .gitgnore: add llvm-bpf

[LEDE Commits]

nbd pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/00ce13490a181cbf411aaca76be44a04604b1fbd

commit 00ce13490a181cbf411aaca76be44a04604b1fbd
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Sun Nov 21 18:18:01 2021 +0100

    .gitgnore: add llvm-bpf
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 .gitignore | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.gitignore b/.gitignore
index 91e257f5a9..a80cdbbea3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,6 +18,7 @@
 /package/feeds
 /package/openwrt-packages
 /*.patch
+/llvm-bpf*
 key-build*
 *.orig
 *.rej