Moved malloc implementations to a separate folder

photon/libc/malloc/dlmalloc/malloc.c

@@ -231,12 +231,23 @@
 
 /* #define WIN32 */
 
+#if __STD_C
+#include <stddef.h>   /* for size_t */
+#else
+#include <sys/types.h>
+#endif
+
 #ifdef __magenta__
 #define LACKS_UNISTD_H
 #define LACKS_SYS_PARAM_H
 #define LACKS_SYS_MMAN_H
 
+extern void *__extend_heap(size_t sz);
+
 #define HAVE_MMAP 0
+#define MORECORE __extend_heap
+#define MORECORE_CONTIGUOUS 1
+
 #endif
 
 #ifdef WIN32
@@ -311,12 +322,6 @@ static int cpuinfo (int whole, unsigned long*kernel, unsigned long*user);
 #endif
 #endif /*Void_t*/
 
-#if __STD_C
-#include <stddef.h>   /* for size_t */
-#else
-#include <sys/types.h>
-#endif
-
 #ifdef __cplusplus
 extern "C" {
 #endif