[xml] configure --with-threads and config.log

["peterbarrie" <peterbarrie btconnect com>]

I'm configuring libxml2 under QNX x86 V6.2.1
libxml2 2.6.18

Here's some of the output from ./configure --with-mem-debug
--with-threads
8<...
Enabling multithreaded support
checking pthread.h usability... yes
checking pthread.h presence... yes
checking for pthread.h... yes
checking for pthread_join in -lpthread... no
8<...

That looks good. 

Can somebody verify the that resulting WITH_THREADS output
in the generated config.log is normal for the --with-threads
configuration...

part of my config.log
8<...
WITH_THREADS='0'
8<...

Thanks

Pete