sim: bpf: enable -Werror usage

Now that all bpf warnings have been cleaned up, turn on -Werror.

sim/bpf/ChangeLog

diff --git a/sim/bpf/ChangeLog b/sim/bpf/ChangeLog
index ce38385..046c450 100644
--- a/sim/bpf/ChangeLog
+++ b/sim/bpf/ChangeLog
@@ -1,5 +1,9 @@
 2021-06-28  Mike Frysinger  <vapier@gentoo.org>
 
+	* Makefile.in (SIM_WERROR_CFLAGS): Delete.
+
+2021-06-28  Mike Frysinger  <vapier@gentoo.org>
+
 	* bpf.c (bpfbf_exit): Use PRI 64 formats.
 
 2021-06-27  Mike Frysinger  <vapier@gentoo.org>

sim/bpf/Makefile.in

diff --git a/sim/bpf/Makefile.in b/sim/bpf/Makefile.in
index c48c378..3188ab1 100644
--- a/sim/bpf/Makefile.in
+++ b/sim/bpf/Makefile.in
@@ -41,9 +41,6 @@
 
 SIM_EXTRA_CLEAN = bpf-clean
 
-# Code doesn't build cleanly yet.
-SIM_WERROR_CFLAGS =
-
 ## COMMON_POST_CONFIG_FRAG
 
 # BPF headers