Log Message:
Update arena to 0.9.13.
Patch provided by Leonardo Taccari in PR 39142.

While here define test target, confirmed to pass all tests on NetBSD/i386 4.0.

Version 0.9.13
04 Sep 2007

 - make static methods calling each other work correctly

Version 0.9.12
19 Aug 2007

 - change system() library function to return raw exit code

Version 0.9.11
14 Aug 2007

 - change signature type to also contain the function name
 - add function_name() library function

Version 0.9.10
07 Jan 2007

 - fix documentation of gmtime() and localtime() to list needed argument
 - add mputstring() and mgetstring() library functions
 - add cfloat() library function for calling C function that expect "float"
   instead of "double"