Add VS2026 platform toolset mapping (#949)

* Add VS2026 platform toolset mapping

* Fixing HCLibToolset

Author: jasonsandlin

Build/libHttpClient.GDK.props

@@ -39,6 +39,7 @@
     <Keyword>Win32Proj</Keyword>
     <PlatformToolset Condition="'$(PlatformToolset)' == '' and $(VisualStudioVersion)==16">v142</PlatformToolset>
     <PlatformToolset Condition="'$(PlatformToolset)' == '' and $(VisualStudioVersion)==17">v143</PlatformToolset>
+    <PlatformToolset Condition="'$(PlatformToolset)' == '' and $(VisualStudioVersion)==18">v143</PlatformToolset>
     <TargetRuntime>Native</TargetRuntime>
     <CharacterSet>Unicode</CharacterSet>
     <GenerateManifest>false</GenerateManifest>

Build/libHttpClient.Win32.props

@@ -44,6 +44,7 @@
     <Keyword>Win32Proj</Keyword>
     <PlatformToolset Condition="'$(PlatformToolset)' == '' and $(VisualStudioVersion)==16">v142</PlatformToolset>
     <PlatformToolset Condition="'$(PlatformToolset)' == '' and $(VisualStudioVersion)==17">v143</PlatformToolset>
+    <PlatformToolset Condition="'$(PlatformToolset)' == '' and $(VisualStudioVersion)==18">v143</PlatformToolset>
     <CharacterSet>Unicode</CharacterSet>
     <DefaultLanguage>en-US</DefaultLanguage>
     <PreferredToolArchitecture>x64</PreferredToolArchitecture>

Build/libHttpClient.import.props

@@ -21,6 +21,7 @@
     <HCLibToolset Condition="'$(PlatformToolset)'=='v141'">141</HCLibToolset>
     <HCLibToolset Condition="'$(PlatformToolset)'=='v142'">142</HCLibToolset>
     <HCLibToolset Condition="'$(PlatformToolset)'=='v143'">143</HCLibToolset>
+    <HCLibToolset Condition="'$(PlatformToolset)'=='v145'">145</HCLibToolset>
     <HCProjectName>libHttpClient.$(HCLibToolset).$(HCPlatform).C</HCProjectName>
   </PropertyGroup>
   <PropertyGroup>