Make wreal an extra keyword in Icarus.
Make wreal an extra keyword in Icarus.

Most people doing real modeling don't want to bring in the whole
Verilog-AMS infrastructure to use wreal nets. This patch adds the
wreal keyword to the xtypes generation so that wreal is available
by default.

themperek/iverilog,CastMi/iverilog,CastMi/iverilog,themperek/iverilog,themperek/iverilog,CastMi/iverilog