Appveyor: disable VS2013 build

Author: rainers

CHANGES

@@ -1102,6 +1102,7 @@ Version history
 2019-04-20 0.49.1
   * fixed reading settings from VC projects in VS2017
   * fixed determining versions from dmd versions no longer supporting -gc
+  * fixed reading import path from newer LDC versions
   * added support for VS2019 Update 16.1
   * dparser:
     - jump to original definition if it is not renamed or the caret is on the import

appveyor.yml

@@ -21,9 +21,9 @@ environment:
     - os: Visual Studio 2015
       VS: 14
       APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-    - os: Visual Studio 2013
-      VS: 12
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+#    - os: Visual Studio 2013
+#      VS: 12
+#      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
 
 # cache relative to C:\projects\visuald
 cache:

msbuild/ImportAfter/general_d.targets

@@ -2,7 +2,7 @@
 <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
 
   <ItemGroup Condition="'$(UseDefaultPropertyPageSchemas)' != 'false'">
-    <PropertyPageSchema Condition="'$(ConfigurationType)' != 'Utility'" Include="$(VisualDMSBuildDir)\general_d.$(MSBuildVersion_Major).0.xml">
+    <PropertyPageSchema Condition="'$(ConfigurationType)' != 'Utility' and Exists('$(VisualDMSBuildDir)\general_d.$(MSBuildVersion_Major).0.xml')" Include="$(VisualDMSBuildDir)\general_d.$(MSBuildVersion_Major).0.xml">
       <Context>Project</Context>
     </PropertyPageSchema>
   </ItemGroup>

visuald_vs10.sln

@@ -115,7 +115,6 @@ EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "ImportBefore", "ImportBefore", "{6C5387E8-CF11-443A-88BD-CA6DCA80E755}"
 	ProjectSection(SolutionItems) = preProject
 		msbuild\ImportBefore\d.props = msbuild\ImportBefore\d.props
-		msbuild\ImportBefore\d.targets = msbuild\ImportBefore\d.targets
 	EndProjectSection
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Default", "Default", "{AB498803-493D-4FB4-9FB1-9CEF0E628CE9}"