[patch] Fix oddity in personality routine

[Boehm, Hans]

> From:  Jack Howarth
> Do you think that  -Wl,-allow_stack_execute needs to be 
> passed even more widely than on just ecjx_LDFLAGS? Any 
> suggestions as to where I should be passing it? Perhaps on 
> something like LIBJAVA_LDFLAGS_NOUNDEF at the toplevel of 
> libjava? Or should we even be building libffi and boehm-gc 
> with that as well?
>                      Jack
> 
> 
I haven't been following this completely, but:

The GC also has a compile-time flag NO_EXECUTE_PERMISSION, which affects heap executability.  I think the documentation says that this only affects incremental collection, but looking at the code, I'm not sure I believe that anymore.  I think it generally affects whether memory allocated with mmap is made executable, and we've been doing more and more of that.

Hans