antirez/redis — pull request #434 by anydot (2012-04-05 06:41:34+00:00)
Title: Futureproof version comparison in zmalloc.h; glibc has malloc_usable size

First commit futureproofs version comparison in zmalloc.h, as the comparison will be broken in case of new major tc/je malloc version.

Also if we are forced to use pure malloc on glibc, we can use malloc_usable_size (simillar #elif could be added for BSD as well, but I currently don't have any BSD on hand to test it)