fix HostBits/TargetBits determination for s390x

Author: alexrp

src/sdk/build/Vezel.Zig.Sdk.Cross.Host.targets

@@ -23,7 +23,7 @@
 
     <PropertyGroup>
         <HostBits>32</HostBits>
-        <HostBits Condition="$(HostArchitecture.Contains('64'))">64</HostBits>
+        <HostBits Condition="$(HostArchitecture.Contains('64')) or '$(HostArchitecture)' == 's390x'">64</HostBits>
     </PropertyGroup>
 
     <PropertyGroup>

src/sdk/build/Vezel.Zig.Sdk.Cross.Target.targets

@@ -24,7 +24,7 @@
 
     <PropertyGroup>
         <TargetBits>32</TargetBits>
-        <TargetBits Condition="$(TargetArchitecture.Contains('64'))">64</TargetBits>
+        <TargetBits Condition="$(TargetArchitecture.Contains('64')) or '$(TargetArchitecture)' == 's390x'">64</TargetBits>
     </PropertyGroup>
 
     <PropertyGroup Condition="$(TargetRuntimeIdentifier.StartsWith('linux-'))">