configure: hwaccel autodetection has been removed in 82ca17ac

If you want it back (yeah i want it back too)
then you just need to volunteer to maintain the code in configure
thats related to hwaccel autodetection.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

configure

@@ -142,9 +142,9 @@ Component options:
 
 Hardware accelerators:
   --enable-dxva2           enable DXVA2 code
-  --enable-vaapi           enable VAAPI code [autodetect]
-  --enable-vda             enable VDA code   [autodetect]
-  --enable-vdpau           enable VDPAU code [autodetect]
+  --enable-vaapi           enable VAAPI code
+  --enable-vda             enable VDA code
+  --enable-vdpau           enable VDPAU code
 
 Individual component options:
   --disable-everything     disable all components listed below