Changing portability from the default causes builds to fail

[crummel]

• OSX and Linux currently default to nonportable and will fail if this is overridden.
• Windows currently defaults to portable and will fail if this is overridden.

[omajid]

FWIW, on release/2.1 on Linux, this was a matter of:

--- a/repos/cli.proj
+++ b/repos/cli.proj
@@ -20,7 +20,7 @@
     <BuildCommandArgs>$(BuildCommandArgs) /p:SkipBuildingInstallers=true</BuildCommandArgs>
     <BuildCommandArgs>$(BuildCommandArgs) /p:IncludeNuGetPackageArchive=false</BuildCommandArgs>
     <BuildCommandArgs>$(BuildCommandArgs) /p:IncludeAdditionalSharedFrameworks=false</BuildCommandArgs>
-    <BuildCommandArgs>$(BuildCommandArgs) /p:UsePortableLinuxSharedFramework=false</BuildCommandArgs>
+    <BuildCommandArgs>$(BuildCommandArgs) /p:UsePortableLinuxSharedFramework=$(PortableBuild)</BuildCommandArgs>
     <BuildCommandArgs>$(BuildCommandArgs) /p:IncludeSharedFrameworksForBackwardsCompatibilityTests=false</BuildComman
     <BuildCommandArgs>$(BuildCommandArgs) /p:IncludeMSBuildSdkResolver=false</BuildCommandArgs>
     <BuildCommandArgs>$(BuildCommandArgs) /p:DefaultTargetLatestAspNetCoreRuntimePatch=true</BuildCommandArgs>

[crummel]

Thanks! Nice that this should be an easy fix.

[crummel]

Portable and non-portable SDK builds work on Linux with portable runtime, portable OSX is mandatory as in the official build.