Add default version identifier for dmd, and set the target platform in params. https://dlang.org/spec/version.html#predefined-versions
Needs to be run after all arguments parsing (command line, DFLAGS environment variable and config file) in order to add final flags (such as X86_64 or the CRuntime used).
which target to compile for (set by setTarget())
See Implementation
Add default version identifier for dmd, and set the target platform in params. https://dlang.org/spec/version.html#predefined-versions
Needs to be run after all arguments parsing (command line, DFLAGS environment variable and config file) in order to add final flags (such as X86_64 or the CRuntime used).