Revert "fix test runner"

This reverts commit 8c42dd1f6735eddea1d7441f31bb5839441e794d.
Revert "Support named unittests"

This reverts commit 9bc336d703c4dcfbc087eeb901e447dbba2f72bb.
Revert "Use new unittest format in default runner"

This reverts commit 64aa857d3e3c771b935064ad6d6575c4c40cfe42.
Revert "Add enhanced unittest runtime information"

This reverts commit 9279278770dd3523d759585bea5283cd69be5cf7.
ARM fixes for 2.065
Fix build on PPC64.

Add the missing `fenv_t` and `fexcept_t` types.
Rename DigitalMarsWin32 / DigitalMarsWin64 to DMC_RUNTIME / MSVC_RUNTIME.

This has the advantages:
- DMC_RUNTIME is used in Phobos, too.
- I don't have to write

    version(LDC) version(Win64) version = DigitalMarsWin64;

which I find confusing.
Fix issue 12964 - dev_t is incorrectly defined in runtime for Solaris
systems
Made aliases better match corresponding .h file logic