Static Cygwin wish.exe cannot link with win32's static libtk85.a (because it expects a different runtime), so configure shouldn't even try to do this. 
(On a dynamic wish.exe this works, this is exactly how wish can run even without X11)
Don't use deprecated stricmp/strnicmp any more, but underscored variant for non-GNU compilers.
Static Cygwin wish.exe cannot link with win32's static libtk85.a (because it expects a different runtime), so configure shouldn't even try to do this. 
(On a dynamic wish.exe this works, this is exactly how wish can run even without X11). 
Don't use deprecated stricmp/strnicmp any more, but underscored variant for non-GNU compilers.