Hi,
I'm fairly new to D, just playing around with Win32 bindings. I
have a Win32 hello world that works when build via `dmd
.\source\app test-win32.def`. I'm now trying to build the
application via `dub`, but I cannot find what configuration I
would need to do so.
By default, just running `dub`, I get the following error:
```
Performing "debug" build using C:\D\dmd2\windows\bin\dmd.exe for
x86_64.
test-win32 ~master: building configuration "application"...
Linking...
test-win32.obj : error LNK2019: unresolved external symbol
MessageBoxA referenced in function WinMain
.dub\build\application-debug-windows-x86_64-dmd_2091-347A0A76992D6DB80483AD860293313E\test-win32.exe
: fatal error LNK1120: 1 unresolved externals
Error: linker exited with status 1120
C:\D\dmd2\windows\bin\dmd.exe failed with exit code 1.
```
The code is the one from https://wiki.dlang.org/D_for_Win32, with
a simple extra `MessageBoxA` in the function `myWinMain`.
I'm a bit surprised to see a linking error given that building
directly from `dmd` seems to work fine without any flag.
What am I missing?
