Disable the Powershell self-hosted build process

powershell-disable-selfhost-build.patch

diff --git a/build.sh b/build.sh
index 33c4d745..3891c2ca 100755
--- a/build.sh
+++ b/build.sh
@@ -1,10 +1,6 @@
 #!/usr/bin/env bash
 set -e
 
-if hash powershell 2>/dev/null; then
-    echo 'Continuing with `powershell -noprofile -c Start-PSBuild`'
-    powershell -noprofile -c "Import-Module ./build.psm1; Start-PSBuild"
-else
    echo 'Continuing with full manual build'
 
    ## Restore
@@ -56,4 +52,3 @@ EOF
    dotnet publish --configuration Linux src/powershell-unix/ --output bin --runtime $rid
 
    echo 'You can run powershell from bin/, but some modules that are normally added by the Restore-PSModule step will not be available.'
-fi