Description:
------------
Memcache client isn't able to increment or decrement keys by values larger that or equal to 2^31, because it cast delta argument to 32-bit int.

Reproduce code:
---------------
Increment any key by 2500000000.

Patch:
memcache.c:
243c243
< static int mmc_incr_decr(mmc_t *, int, char *, int, int, long * TSRMLS_DC);
---
> static int mmc_incr_decr(mmc_t *, int, char *, int, long, long * TSRMLS_DC);
1743c1743
< static int mmc_incr_decr(mmc_t *mmc, int cmd, char *key, int key_len, int value, long *number TSRMLS_DC) /* {{{ */
---
> static int mmc_incr_decr(mmc_t *mmc, int cmd, char *key, int key_len, long value, long *number TSRMLS_DC) /* {{{ */
1749c1749
< command_len = spprintf(&command, 0, "incr %s %d", key, value);
---
> command_len = spprintf(&command, 0, "incr %s %ld", key, value);
1752c1752
< command_len = spprintf(&command, 0, "decr %s %d", key, value);
---
> command_len = spprintf(&command, 0, "decr %s %ld", key, value);

Still, it will not fix it on 32-bit machines, but one could try using 'long long' and '%lld', but more changes might be required in other functions, as they seem to user 'long' values too.

Actual result:
--------------
CLIENT_ERROR invalid numeric delta argument