Cannot build cperl 5.28.0

[fperrad]

There are new variables in xconfig.h.

xconfig.h:3340:3: error: invalid preprocessing directive #HAS_BUILTIN_CLZ
 # HAS_BUILTIN_CLZ /**/
   ^~~~~~~~~~~~~~~
xconfig.h:3727:3: error: invalid preprocessing directive #HAS_GETCWDNULL
 # HAS_GETCWDNULL  /**/
   ^~~~~~~~~~~~~~
xconfig.h:3734:3: error: invalid preprocessing directive #HAS_GET_CURRENT_DIR_NAME
 # HAS_GET_CURRENT_DIR_NAME  /**/
   ^~~~~~~~~~~~~~~~~~~~~~~~
xconfig.h:3740:3: error: invalid preprocessing directive #HAS_REALPATH
 # HAS_REALPATH  /**/
   ^~~~~~~~~~~~
xconfig.h:5406:3: error: invalid preprocessing directive #USE_NAMED_ANONCV
 # USE_NAMED_ANONCV  /**/
   ^~~~~~~~~~~~~~~~

[arsv]

Fixed, both 5.28.0 (released Sep 2018) and 5.28.2 (released Mar 2019) should build now.

And I think I'm going to add 5.30.0 which seems to be the latest stable release of cperl.

[fperrad]

Good news.
In fact, we miss a lot of cperl releases:

• 5.24.3, 5.24.4
• 5.26.2, 5.26.3, 5.26.4, 5.26.5
• 5.28.0, 5.28.1, 5.28.2
• 5.30.0