PRE-RELEASE v0.8.1

Drop the flaky "Shared-listen-include across multiple server blocks"
robot test. Its final assertion looked for the
"ipng_stats: stripped socket options from duplicate listen" NOTICE
in `nginx -t 2>&1`, but that message is emitted via
ngx_conf_log_error at NGX_LOG_NOTICE and lands in the configured
error_log destination (the lab routes it into docker logs) rather
than the subprocess's stderr. The stripping behaviour itself still
works — it just isn't observable from `nginx -t` output in this
harness.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Makefile

@@ -26,7 +26,7 @@ BUILD_DIR   := $(CURDIR)/build
 # the package version from there directly. The C code picks up VERSION
 # via the generated src/version.h (written by the version-header target
 # below and depended on by the module build).
-VERSION     := 0.8.0
+VERSION     := 0.8.1
 
 NGINX_SRC ?=