mruby/mruby — pull request #1290 by kyab (2013-06-20 09:04:17+00:00)
Title: Fix compile warning for abort() when MRB_GC_STRESS is defined

My clang warn as below.

```
CC src/gc.c -> build/host/src/gc.o
/Users/koji/work/mruby/mruby/src/gc.c:385:5: warning: implicitly declaring
library function 'abort' with type 'void (void)
__attribute__((noreturn))'
abort();
^
/Users/koji/work/mruby/mruby/src/gc.c:385:5: note: please include the header
or explicitly provide a declaration for 'abort'
1 warning generated.

```