Cleanup old caffe2 scripts (#158475)

Testing on this one is grep based: if there were no reference to that script I can find, I deleted.
We can easily add any of these back if needed!
Pull Request resolved: https://github.com/pytorch/pytorch/pull/158475
Approved by: https://github.com/seemethere, https://github.com/huydhn, https://github.com/cyyever

scripts/proto.ps1

@@ -1,18 +0,0 @@
-param(
-  [string]$protoc,
-  [string]$srcdir,
-  [string]$unprocessed,
-  [string]$processed,
-  [string]$out
-)
-$ErrorActionPreference = "Stop"
-Get-Content $unprocessed | % {$_ -Replace "caffe2/proto/caffe2.proto", "caffe2.proto"} | Set-Content $processed
-Add-Content -Path $processed -Value "option optimize_for = LITE_RUNTIME;`n" -NoNewline
-$dir = (Get-Item $processed).DirectoryName
-
-copy $srcdir/caffe2/proto/caffe2.proto $srcdir/caffe2.proto
-Add-Content -Path $srcdir/caffe2.proto -Value "option optimize_for = LITE_RUNTIME;`n" -NoNewline
-
-$processed = (Get-Item $processed).Name
-$cmd = "$protoc -I${dir} --cpp_out=$out $processed"
-Invoke-Expression $cmd