misleading documentation for configure --enable-threads option

[Greg Thompson]

the install/CONFIGURE file has this to say about the --enable-threads 
option:

     * --enable-threads -- Specify that the target supports threads. This
       affects only the Objective-C compiler and runtime library.

which is dangerously wrong.  without --enable-threads turned on, the 
compiler will generate non-threadsafe stack frame code for c++ exception 
handling.  c++ exception handling is neither part of the Objective-C 
compiler or its runtime library.  it's a fundamental part of the c++ 
compiler.
--
                 -greg
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