Patching build_production.sh again

Author: RIC217

build_production.sh

@@ -1,4 +1,7 @@
-mkdir bin && rm -r bin && mkdir bin
+if [ -f "bin" ]; then
+    rm -r bin
+fi
+mkdir bin
 v -prod -skip-unused -cflags -Os . -o bin/RealTimeWebChatInV_linux_amd64 & v -prod -skip-unused -cflags -Os -os windows . -o bin/RealTimeWebChatInV_windows_amd64.exe
 du bin/RealTimeWebChatInV_*
 strip -s bin/RealTimeWebChatInV_*