Windows: Add warnings about ASIO SDK usage

Related: jamulussoftware#2417

windows/deploy_windows.ps1

@@ -4,6 +4,10 @@ param (
     [string] $QtInstallPath64 = "C:\Qt\5.15.2",
     [string] $QtCompile32 = "msvc2019",
     [string] $QtCompile64 = "msvc2019_64",
+    # Important:
+    # - Do not update ASIO SDK without checking for license-related changes.
+    # - Do not copy (parts of) the ASIO SDK into the Jamulus source tree without
+    #   further consideration as it would make the license situation more complicated.
     [string] $AsioSDKName = "asiosdk_2.3.3_2019-06-14",
     [string] $AsioSDKUrl = "https://download.steinberg.net/sdk_downloads/asiosdk_2.3.3_2019-06-14.zip",
     [string] $NsisName = "nsis-3.08",

windows/sound.h

@@ -30,8 +30,16 @@
 #include "../src/global.h"
 #include "../src/soundbase.h"
 
-// copy the ASIO SDK in the llcon/windows directory: "llcon/windows/ASIOSDK2" to
-// get it work
+// The following includes require the ASIO SDK to be placed in
+// windows/ASIOSDK2 during build.
+// Important:
+// - Do not copy parts of ASIO SDK into the Jamulus source tree without
+//   further consideration as it would make the license situation more
+//   complicated.
+// - When building yourself, read and understand the
+//   Steinberg ASIO SDK Licensing Agreement and verify whether you might be
+//   obliged to sign it as well, especially when considering distribution
+//   of Jamulus Windows binaries with ASIO support.
 #include "asiosys.h"
 #include "asio.h"
 #include "asiodrivers.h"