Add asio lib.

src/hostapi/asio/ASIOSDK/driver/asiosample/asiosample.txt

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+Asiosample
+
+This sample driver illustrates the implementation of an ASIO driver.
+
+
+
+Windows notes:
+
+For Windows a COM implementation is provided. The final driver can be
+installed in the system by dragging the asiosample.dll onto the
+regsvr32.exe in the windows\system directory.
+
+It is normal that the LNK4104 warning is issued for the following 4
+exported symbols:
+
+DllGetClassObject
+DllCanUnloadNow
+DllRegisterServer
+DllUnregisterServer
+
+
+Macintosh notes:
+The supplied project is created with CodeWarrior Pro 5.