Update GNU autoconf and automake infrastructure.
Tested on modern systems as well as Apple A/UX :-)
* autoconf-update:
AUTOMAKE_OPTIONS: fix ansi2knr option, include path
Don't use AC_FUNC_MALLOC and AC_FUNC_REALLOC
Make our own targets "silent", if enabled
configure.in: use AC_CHECK_{FUNCS|HEADERS}_ONCE
Updated config.{guess|sub} to version 2012-08-14
Make autogen.sh more verbose when VERBOSE=1 is set
configure.in: use AC_SEARCH_LIBS (not AC_CHECK_LIB)
configure.in: use AS_HELP_STRING macro
configure.in: use AC_CANONICAL_HOST (not AC_CANONICAL_TARGET)
configure.in: inttypes.h is an optional header file
Use HAVE_SETSID #define when testing for setsid()
Don't include <stdint.h>, it is included by "portab.h"
Don't check type.h availability, it is required
configure.in: Use AC_CONFIG_FILES macro
configure.in: Don't use AC_C_PROTOTYPES
configure.in: Update checks for required and optional features
configure.in: require autoconf 2.67 and automake 1.11
configure.in: sort some lists (templates, output, ...)