merge r3452, r3462, r3471, r3472: fix miscellaneous name bugs: *) fix $upstream_http_ variable prefix length *) use a right "Location" header name, however, it did not harm, since ngx_http_variable_sent_location() never use key name field *) fix proxy_redirect name in error message *) "proxy_redirect default" may not be used if a proxy_pass uses variables

# Copyright (C) Igor Sysoev


# 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"
MD5_OPT="$MD5_OPT -Ae"