add freebsd-arm64 and freebsd-x64 to default RuntimeIdentifiers

Author: alexrp

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

@@ -67,6 +67,8 @@
 
     <PropertyGroup>
         <RuntimeIdentifiers Condition="'$(RuntimeIdentifiers)' == ''">
+            freebsd-arm64;
+            freebsd-x64;
             linux-arm;
             linux-arm64;
             linux-loongarch64;