Add linux-s390x support.

This is only supported for cross-compilation for now; toolset packages won't be
available until Zig 0.14.1 or 0.15.0.

Author: alexrp

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

@@ -15,6 +15,7 @@
         <HostArchitecture Condition="$(HostRuntimeIdentifier.EndsWith('-arm'))">arm</HostArchitecture>
         <HostArchitecture Condition="$(HostRuntimeIdentifier.EndsWith('-ppc64le'))">powerpc64le</HostArchitecture>
         <HostArchitecture Condition="$(HostRuntimeIdentifier.EndsWith('-riscv64'))">riscv64</HostArchitecture>
+        <HostArchitecture Condition="$(HostRuntimeIdentifier.EndsWith('-s390x'))">s390x</HostArchitecture>
         <HostArchitecture Condition="$(HostRuntimeIdentifier.EndsWith('-x86'))">x86</HostArchitecture>
         <HostArchitecture Condition="$(HostRuntimeIdentifier.EndsWith('-x64'))">x86_64</HostArchitecture>
     </PropertyGroup>

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

@@ -15,6 +15,7 @@
         <TargetArchitecture Condition="$(TargetRuntimeIdentifier.EndsWith('-arm'))">arm</TargetArchitecture>
         <TargetArchitecture Condition="$(TargetRuntimeIdentifier.EndsWith('-ppc64le'))">powerpc64le</TargetArchitecture>
         <TargetArchitecture Condition="$(TargetRuntimeIdentifier.EndsWith('-riscv64'))">riscv64</TargetArchitecture>
+        <TargetArchitecture Condition="$(TargetRuntimeIdentifier.EndsWith('-s390x'))">s390x</TargetArchitecture>
         <TargetArchitecture Condition="$(TargetRuntimeIdentifier.EndsWith('-x86'))">x86</TargetArchitecture>
         <TargetArchitecture Condition="$(TargetRuntimeIdentifier.EndsWith('-x64'))">x86_64</TargetArchitecture>
         <TargetArchitecture Condition="$(TargetRuntimeIdentifier.EndsWith('-wasm'))">wasm32</TargetArchitecture>

src/sdk/build/Vezel.Zig.Sdk.Defaults.targets

@@ -72,10 +72,12 @@
             linux-arm64;
             linux-ppc64le;
             linux-riscv64;
+            linux-s390x;
             linux-x64;
             linux-musl-arm;
             linux-musl-arm64;
             linux-musl-riscv64;
+            linux-musl-s390x;
             linux-musl-x64;
             osx-arm64;
             osx-x64;