[arm32/CI] host packages are not yet available for armel

[hqueue]

We can not use -buildArch and -RuntimeOS for armel when building managed code, because armel host packages are not yet available.

For example, we can build managed code for ubuntu.16.04-arm with following options.
./build-managed.sh -Release -buildArch=arm -RuntimeOS=ubuntu.16.04

But we can't build for tizen.4.0.0-armel yet, so we build managed code with following workaround command witch restore x64 host packages instead of armel host packages.
./build-managed.sh -Release

We use the workaround command for arm32 CI for armel too. (in PR dotnet/corefx#15900)
Therefore when armel host packages are published, we have to update arm32 CI script for armel to use standard options.

Related issue is tracked at #20225.

@gkhanna79 @jyoungyun

[weshaggard]

@hqueue @jyoungyun is this still tracking for ZBB 5/10?

[jyoungyun]

After uploading coreclr nupkgs into myget feed, -buildArch and -RuntimeOS option is avaliable for armel build. So this issue can be closed.

@hqueue Please close this issue.