Remove more windows cruft

diff --git a/build.cmd b/build.cmd
deleted file mode 100755 (executable)
index 52cb883..0000000
--- a/build.cmd
+++ /dev/null
@@ -1,6 +0,0 @@
-@echo off
-
-REM builds wireguard for windows
-
-go get
-go build -o wireguard-go.exe