wip: vendor: update buildkit to master@7e4280003fa5

Signed-off-by: Justin Chadwell <me@jedevc.com>

vendor/github.com/Microsoft/hcsshim/.gitignore

@@ -0,0 +1,49 @@
+# Binaries for programs and plugins
+*.exe
+*.dll
+*.so
+*.dylib
+
+# Ignore vscode setting files
+.vscode/
+.idea/
+
+# Test binary, build with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Project-local glide cache, RE: https://github.com/Masterminds/glide/issues/736
+.glide/
+
+# Ignore gcs bin directory
+service/bin/
+service/pkg/
+
+*.img
+*.vhd
+*.tar.gz
+*.tar
+
+# Make stuff
+.rootfs-done
+bin/*
+rootfs/*
+rootfs-conv/*
+*.o
+/build/
+
+deps/*
+out/*
+
+# test results
+test/results
+
+# go workspace files
+go.work
+go.work.sum
+
+# keys and related artifacts
+*.pem
+*.cose