Jemalloc under CYGWIN

[Yucong Sun]

> What exactly is the malloc problem you're seeing?

The specific problem I'm having is that jemalloc's malloc_init() calls
needs to use pthread_mutex_init()  or even pthread_mutex with a
initializer.   Both in-turn uses malloc, triggering this issue.

A quick fix would be somehow make pthread always use system
malloc/free, which shouldn't be that bad.

Another issue I saw is that jemalloc will use readlink()  for
"/etc/jemalloc.conf" during malloc_init(), which on cygwin, this
function uses "new" to do some path manipulating work, which also have
the same issue.  However, we can probably just disable that .

So, the quickest fix would be to make cygwin's thread implementations
always use system malloc.

some small workarounds in jemalloc would be needed afterwards, but it
should be a nice starting point.

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