[PATCH/libiberty] Fix PR38903 Cygwin GCC bootstrap failure [was Re: Libiberty issue vs cygwin [was Re: This is a Cygwin failure yeah?]]

[DJ Delorie]

>   Ok for HEAD of both gcc/ and src/ ?

Ok.

> libiberty/ChangeLog
> 
> 	* configure.ac (funcs, vars, checkfuncs):  Don't munge on Cygwin,
> 	as it no longer shares libiberty object files.
> 	* configure:  Regenerated.