Revert "Restore posix_memalign"

This reverts commit bfc1d97531.

libc/bionic/malloc_debug_common.c

@@ -210,11 +210,6 @@ void* pvalloc(size_t bytes)
     return dlpvalloc(bytes);
 }
 
-int posix_memalign(void** memptr, size_t alignment, size_t size)
-{
-    return dlposix_memalign(memptr, alignment, size);
-}
-
 /* Support for malloc debugging.
  * Note that if USE_DL_PREFIX is not defined, it's assumed that memory
  * allocation routines are implemented somewhere else, so all our custom