DMD release compiler flags when building with LDC

[Per Nordlöw]

On Wednesday, 23 October 2019 at 10:34:17 UTC, Daniel Kozak wrote:
>> This works for me.
> https://bugs.archlinux.org/task/63569

Shouldn't

  +ifeq ($(HOST_DMD_KIND), ldc)

be

  +ifeq ($(HOST_DMD_KIND), ldc2)

?