a gdb patch for fbsd

[Zhouyi Zhou]

Dear all,
    Following is  a patch to current gdb support in FreeBSD.
I think it is useful when FreeBSD is not going to upgrade its gdb to gdb 
6.x.
   The patch settle the core dump problem of attach command without a object 
file:
#gdb
gdb> attach XXXX
http://www.vlakno.cz/~rdivacky/gdb.patch
   Thanks rdivacky @FreeBSD.org for encouraging me settle this bug.
Sincerely
Zhouyi Zhou