d: Detect recent DMD compilers

They now are published by the D Language Foundation, and not Digital
Mars. Therefore, their signature has changed slightly.
(We can not check for 'DMD', because that string appears in every
compiler version output to denote the frontend version used by the
compiler).

mesonbuild/environment.py

@@ -727,7 +727,7 @@ class Environment:
             return compilers.LLVMDCompiler(exelist, version, is_cross)
         elif 'gdc' in out:
             return compilers.GnuDCompiler(exelist, version, is_cross)
-        elif 'Digital Mars' in out:
+        elif 'The D Language Foundation' in out or 'Digital Mars' in out:
             return compilers.DmdDCompiler(exelist, version, is_cross)
         raise EnvironmentException('Unknown compiler "' + ' '.join(exelist) + '"')