PLI 1 was deprecated in 1364-2005, so disable by default and note that
it is deprecated in the help text.
This works round the problem that the clang linker (lld) in MSYS2 does
not support the -r option, so cannot be used to build libveriuser.a.
This configure option causes the installed commands to have
a suffix string that makes them distinct from other versions
that also have a suffix string. This allows for multiple
installed versions of Icarus Verilog.
Also, move installed C/C++ header files into a subdirectory of
their own under the target include directory, to make clearer
the purpose and source of those files.
Martin Whitaker
Martin Whitaker
Cary R
Stephen Williams