- Added (dummy) __init/fini_wut_malloc stubs called by wutcrt
in order to ensure that wutmalloc gets linked in
- malloc/realloc/calloc now properly set errno to ENOMEM during failure
- realloc no longer fails if ptr==NULL (in this case it works
like a regular malloc)
- realloc no longer does an out of bounds copy if the new size
is smaller than the old size
- free(NULL) is now supported as per the C standard
- Disabled sbrk/malloc-lock support code in wutnewlib because
newlib's malloc is replaced with wutmalloc
26ac7b3ff2