AC_PROG_CC_C99 is obsolete with autoconf >= 2.70

[petk]

To make sure that compiler supports C99 before Autoconf 2.69, this was needed. But with Autoconf 2.70 and later the macro is obsolete because the checks are done in AC_PROG_CC and warnings are emitted when building configure script on newer Autoconf versions.

Once PHP will require Autoconf 2.70 or newer, this can be removed. The AC_PROG_CC is added by phpize.m4 from the php-src repository.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (9c08e1a) 72.97% compared to head (ea120e8) 72.97%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5254   +/-   ##
=======================================
  Coverage   72.97%   72.97%           
=======================================
  Files          69       69           
  Lines       14858    14858           
=======================================
  Hits        10843    10843           
  Misses       4015     4015           

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