add files for msys2 builds on windows

bundle_dlls.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+# msys2-bundledlls - Copy DLLs linked against a Windows executable for bundling with a distribution
+
+if [ "$#" -ne 2 ];
+then
+	echo "Usage: ./bundledlls <executable> <directory>"
+	exit
+fi
+
+mkdir -p $2
+
+# Get list of dynamic libraries, filter by ones that are found in the current MSYS2 prefix
+# and strip off everything but the full path. E.g.:
+#   `lua51.dll => /ucrt64/bin/lua51.dll (0xdeadbeef)` => `/ucrt64/bin/lua51.dll`
+list=$(ldd $1 | grep $MINGW_PREFIX | sed 's/.* => //' | sed 's/ \(.*\)//')
+
+for dll in $list;
+do
+	echo $dll
+	cp $dll $2/
+done