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This updates the minimum required Autoconf version to 2.71. - Autoconf versions 2.70 started supporting C11 standards. - Autoconf 2.71 was released soon after 2.70 providing some bugfixes. Changes: - Removed obsolete AC_PROG_CC_C99 macro. In Autoconf 2.70 and later this is done by the AC_PROG_CC macro. - m4_normalize is not needed for AC_CHECK_HEADERS and AC_CHECK_FUNCTIONS macros anymore, as the argument is normalized internally by Autoconf in these newer versions. - Adjusted C11 check in configure.ac and added check also in phpize mode. Extensions using PHP headers should be also built with some C11-compliant compiler. - Removed ac_cv_header_sys_types_h_makedev hack for AC_HEADER_MAJOR macro when using Autoconf versions prior to 2.70. - Replaced AC_CONFIG_MACRO_DIR with preferred AC_CONFIG_MACRO_DIRS. This also enables using --runstatedir configure option in the future.