Separate out the common malloc into newbrt/memory.c, and put the os-specific stuff into windows and linux subdirs. Things are broken. Addresses #1343.

git-svn-id: file:///svn/toku/tokudb.1032b+1343@8559 c7de825b-a66e-492c-adef-691d508d4ae1

linux/os_malloc.c

@@ -0,0 +1,23 @@
+/* -*- mode: C; c-basic-offset: 4 -*- */
+#ident "Copyright (c) 2007, 2008 Tokutek Inc.  All rights reserved."
+
+#include "toku_portability.h"
+#include <malloc.h>
+
+void *
+os_malloc(size_t size)
+{
+    return malloc(size);
+}
+
+void *
+os_realloc(void *p, size_t size)
+{
+    return realloc(p, size);
+}
+
+void
+os_free(void* p)
+{
+    free(p);
+}