Find and link network library as needed with AC_SEARCH_LIBS (#13553)

This prepends -lnetwork as needed (Haiku) whether linker sees the
setsockopt function and avoids defining redundant symbols, such as
HAVE_LIBNETWORK and HAVE_SETSOCKOPT.

Author: petk

configure.ac

@@ -375,6 +375,9 @@ esac
 dnl Solaris/Illumos for process mapping.
 AC_SEARCH_LIBS([Pgrab], [proc])
 
+dnl Haiku does not have network api in libc.
+AC_SEARCH_LIBS([setsockopt], [network])
+
 dnl Then headers.
 dnl ----------------------------------------------------------------------------
 
@@ -644,9 +647,6 @@ dnl Some systems (Solaris 10) do not have nanosleep in libc.
 AC_CHECK_FUNCS([nanosleep],,
   [AC_SEARCH_LIBS([nanosleep], [rt], [AC_DEFINE([HAVE_NANOSLEEP], [1])])])
 
-dnl Haiku does not have network api in libc.
-PHP_CHECK_FUNC_LIB(setsockopt, network)
-
 dnl Check for getaddrinfo, should be a better way, but... Also check for working
 dnl getaddrinfo.
 AC_CACHE_CHECK([for getaddrinfo], ac_cv_func_getaddrinfo,