HTTP/2: invalid connection preface logging (ticket #1981). Previously, invalid connection preface errors were only logged at debug level, providing no visible feedback, in particular, when a plain text HTTP/2 listening socket is erroneously used for HTTP/1.x connections. Now these are explicitly logged at the info level, much like other client-related errors.

# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


# aCC: HP ANSI C++ B3910B A.03.55.02

# C89 mode

CFLAGS="$CFLAGS -Ae"
CC_TEST_FLAGS="-Ae"

PCRE_OPT="$PCRE_OPT -Ae"
ZLIB_OPT="$ZLIB_OPT -Ae"