wasapi: fix unresolved symbol linker error with vs2017 on win10

ERROR: unresolved external symbol PKEY_AudioEngine_DeviceFormat

Apparently the order of the header includes matters, and initguid.h
must be included first. Let's hope this doesn't break anything on
the other toolchains.

https://social.msdn.microsoft.com/Forums/windowsdesktop/en-US/ceff4e2d-8f63-4ab6-b09b-fdac65d62a80/pkeyaudioenginedeviceformat-link-error?forum=windowspro-audiodevelopment
diff --git a/sys/wasapi/gstwasapiutil.c b/sys/wasapi/gstwasapiutil.c
index 5d664df..016c415 100644
--- a/sys/wasapi/gstwasapiutil.c
+++ b/sys/wasapi/gstwasapiutil.c
@@ -32,7 +32,6 @@
 #if defined(_MSC_VER)
 #include <functiondiscoverykeys_devpkey.h>
 #elif !defined(PKEY_Device_FriendlyName)
-#include <initguid.h>
 #include <propkey.h>
 DEFINE_PROPERTYKEY (PKEY_Device_FriendlyName, 0xa45c254e, 0xdf1c, 0x4efd, 0x80,
     0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0, 14);
diff --git a/sys/wasapi/gstwasapiutil.h b/sys/wasapi/gstwasapiutil.h
index 251c224..4fa2e08 100644
--- a/sys/wasapi/gstwasapiutil.h
+++ b/sys/wasapi/gstwasapiutil.h
@@ -25,6 +25,7 @@
 #include <gst/audio/gstaudiosrc.h>
 #include <gst/audio/gstaudiosink.h>
 
+#include <initguid.h>
 #include <mmdeviceapi.h>
 #include <audioclient.h>