Patch: Fixed signals memory leak

[Black Penguin]

Hi, there

I found there are 256 bytes still reachable after ev_default_destroy():

Valgrind log:

==1878== 256 bytes in 1 blocks are still reachable in loss record 1 of 2
==1878==    at 0x4025868: malloc (vg_replace_malloc.c:207)
==1878==    by 0x40259AC: realloc (vg_replace_malloc.c:429)
==1878==    by 0x804B675: ev_realloc (ev.c:467)
==1878==    by 0x804EFD8: ev_signal_start (ev.c:2477)
==1878==    by 0x804F1B5: ev_default_loop_init (ev.c:1724)
==1878==    by 0x8051357: SchedulerLibEv::SchedulerLibEv(char const*)
(ev.h:454)
==1878==    by 0x804A2A7: main (test-timer-libev.cpp:80)
==1878==

ev.c

struct ANSIG *signals;

alloced in ev_default_loop() -> ev_signal_init () ...

but not freed in ev_default_destroy() -> ev_signal_stop ()

Patch is attached.
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