Bug #13354 --with-pstack compile failure on linuxc

Description:
the "asection" structure definition does not necessarily contain a _cooked_size member,
this leads to compile errors. 

How to repeat:
> configure --with-pstack
> make
...
pstack.c: In function `decode_symbol':
pstack.c:2203: error: structure has no member named `_cooked_size'
make[1]: *** [pstack.o] Error 1
make[1]: Leaving directory `/home/hartmut/projects/mysql/releases/mysql-5.0.12-beta/pstack'
...

Suggested fix:
Add configure check for "_cooked_size" presence in "asection", 
fall back to its "size" member if "_cooked_size" is undefined?

pstack.c: In function `decode_symbol':
pstack.c:2203: error: structure has no member named `_cooked_size'
make[3]: *** [pstack.o] Error 1
make[3]: Leaving directory `/home/miguel/mysql-5.0/pstack'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/home/miguel/mysql-5.0/pstack'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/miguel/mysql-5.0'
make: *** [all] Error 2
miguel@hegel:~/mysql-5.0> uname -a
Linux hegel 2.6.11.4-20a-default #1 Wed Mar 23 21:52:37 UTC 2005 i686 athlon i386 GNU/Linux
miguel@hegel:~/mysql-5.0>

The next wall we'll hit is that pstack only supports LinuxThreads. We need to find a more portable library for generating backtraces, but this is a backburner project now.

Adding a portable backtrace library is done in 6.0.
After 3 years of neglect, I think it'd be fair to say we have no plans to fix this bug.