Merge branch 'autoconf-update'

Merge branch 'autoconf-update'

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, ...)