autoconf: fix getaddrinfo checking errors on mingw

`AC_CHECK_FUNCS` can not properly check `getaddrinfo` because this
function requires some special headers on mingw.
Using `AC_CHECK_DECL` can effec

autoconf: fix getaddrinfo checking errors on mingw

`AC_CHECK_FUNCS` can not properly check `getaddrinfo` because this
function requires some special headers on mingw.
Using `AC_CHECK_DECL` can effectively solve this issue.

Same for
- getnameinfo
- getprotobynumber
- getservbyname
- inet_ntop
- inet_pton

(cherry picked from commit 6d54be2cc078351b4ce1e469bedc4a976f4e3636)

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autotools: fails build when need but can not find openssl

(cherry picked from commit 53b3be4ee9e814a22876675c0ee004f0ebfb8535)

autotools: attach doxygen target into all target

v2: disable man pages by default
(cherry picked from commit f9c6a14ee089452c74e492edc674260a3717763e)

m4/libevent_openssl.m4: fix detection of openssl

Since commit 506df426dbeb0187bbd3654bd286b4100628fb16, OPENSSL_INCS is
added to CPPFLAGS without any white space, as a result openssl detection
fails

m4/libevent_openssl.m4: fix detection of openssl

Since commit 506df426dbeb0187bbd3654bd286b4100628fb16, OPENSSL_INCS is
added to CPPFLAGS without any white space, as a result openssl detection
fails on:
configure:10395: checking openssl/ssl.h usability
configure:10395: /home/fabrice/buildroot-test/buildroot/output/host/bin/riscv32-linux-gcc -c -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -Wall -fno-strict-aliasing -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64-I/home/fabrice/buildroot-test/buildroot/output/host/bin/../riscv32-buildroot-linux-gnu/sysroot/usr/include conftest.c >&5
<command-line>:0:0: warning: "_FILE_OFFSET_BITS" redefined
<command-line>:0:0: note: this is the location of the previous definition
<command-line>:0:23: error: division by zero in #if

Signed-off-by: Fabrice Fontaine <[email protected]>
(cherry picked from commit 0374b55942e533a3c3997439481a8d05d6c8f729)

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autotools: confirm openssl is working before using

latest versions of macOS provide pkg-config and libraries for an ancient
version of openssl as part of the system, but no headers

(cherry picked f

autotools: confirm openssl is working before using

latest versions of macOS provide pkg-config and libraries for an ancient
version of openssl as part of the system, but no headers

(cherry picked from commit 506df426dbeb0187bbd3654bd286b4100628fb16)

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autotools/win32: fix searching ssl library

Provide the autoconf m4 macros for the new OpenSSL via pkg-config stuff.

Backport libevent to vanilla Autoconf 2.59 (as used in RHEL5)

Provide OpenSSL style support for multiple threads accessing the same event_base

svn:r684