wget 1.21.2 config gnulib threadlib.m4 serial 31 enables weak references under Cygwin 64

[Brian Inglis]

Cygwin 64 does not support shared library weak references as no 
references may be undefined in Windows DLLs.
Recent gnulib versions (at least 29-31 in bison, wget, and wget2) 
default Cygwin to gl_cv_have_weak=yes.
Bruno Haible has applied a patch (referenced below and in the attached) 
to gnulib threadlib.m4 serial 31, and I have applied a modified version 
to serial 29:

<https://lists.gnu.org/archive/html/bug-gnulib/2021-09/msg00063.html>.
* m4/threadlib.m4 (gl_WEAK_SYMBOLS): Force a "guessing no" result on Cygwin.

The actual patch is in:

https://lists.gnu.org/archive/html/bug-gnulib/2021-09/msg00068.html

--
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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threadlib-m4-31-cygwin-weak-no.patch
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