[dasher] Fix appveyor error about project cannot be found

[Patrick Welche <pwelche src gnome org>]

commit aa6cb12a89ddc657569a1adc15e3c76c9244d841
Author: Cagdas Evren Gerede <cagdasgerede users noreply github com>
Date:   Wed Feb 26 02:18:00 2020 +0300

    Fix appveyor error about project cannot be found

 appveyor.yml | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)
---
diff --git a/appveyor.yml b/appveyor.yml
index b234dcc5..83575338 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,16 +1,15 @@
+environment:
+  expat: 'C:\Program Files (x86)\Expat 2.2.5'
+  GENERATOR: Visual Studio 15 2017
+  PLATFORM: Win32
+  APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+
 install:
   - cmd: choco install wget
   - cmd: wget https://github.com/libexpat/libexpat/releases/download/R_2_2_5/expat-win32bin-2.2.5.exe 
--output-document=C:\expat.exe
   - cmd: C:\expat.exe /silent
-  - cmd: msbuild "Src\Win32\Dasher.sln"
-  - cmd: if exist Src\Win32\Target\Release\Dasher.exe appveyor exit
-  - cmd: if not exist Src\Win32\Target\Release\Dasher.exe exit 1 
 
 configuration: Release
 
-environment:
-  expat: 'C:\Program Files (x86)\Expat 2.2.5'
-  GENERATOR: Visual Studio 15 2017
-  PLATFORM: Win32
-  APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-build: off
+build:
+  project: Src\Win32\Dasher.sln