utils: updates .gitignore to include nfbpf_compile

Reported-by: Mart Frauenlob <mart.frauenlob@chello.at>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
diff --git a/utils/.gitignore b/utils/.gitignore
index ccfd2ec..216d1e4 100644
--- a/utils/.gitignore
+++ b/utils/.gitignore
@@ -1 +1,2 @@
 /nfnl_osf
+/nfbpf_compile