Make the CREATE_VERSION script create the correct file.
Make the CREATE_VERSION script create the correct file.

The version tag is now stored in the version_tag.h file
and is then copied along with the VERSION into the master
version.h file by the Makefile.

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