[build] Use [[ and ]] for condition in dap-ipod.m4
[build] Use [[ and ]] for condition in dap-ipod.m4

[ and ] are clobbered by m4 expansion, and so configure complains about
a missing "-r" command during the ipod check.

ixfalia/banshee,ixfalia/banshee,dufoli/banshee,lamalex/Banshee,lamalex/Banshee,petejohanson/banshee,stsundermann/banshee,petejohanson/banshee,arfbtwn/banshee,petejohanson/banshee,stsundermann/banshee,dufoli/banshee,babycaseny/banshee,mono-soc-2011/banshee,Dynalon/banshee-osx,mono-soc-2011/banshee,dufoli/banshee,ixfalia/banshee,arfbtwn/banshee,babycaseny/banshee,GNOME/banshee,Dynalon/banshee-osx,Carbenium/banshee,GNOME/banshee,Dynalon/banshee-osx,Carbenium/banshee,petejohanson/banshee,Carbenium/banshee,lamalex/Banshee,allquixotic/banshee-gst-sharp-work,GNOME/banshee,GNOME/banshee,directhex/banshee-hacks,stsundermann/banshee,babycaseny/banshee,stsundermann/banshee,lamalex/Banshee,stsundermann/banshee,directhex/banshee-hacks,Dynalon/banshee-osx,lamalex/Banshee,dufoli/banshee,arfbtwn/banshee,babycaseny/banshee,dufoli/banshee,GNOME/banshee,lamalex/Banshee,petejohanson/banshee,dufoli/banshee,mono-soc-2011/banshee,stsundermann/banshee,dufoli/banshee,babycaseny/banshee,arfbtwn/banshee,ixfalia/banshee,directhex/banshee-hacks,allquixotic/banshee-gst-sharp-work,allquixotic/banshee-gst-sharp-work,dufoli/banshee,allquixotic/banshee-gst-sharp-work,mono-soc-2011/banshee,petejohanson/banshee,Carbenium/banshee,stsundermann/banshee,ixfalia/banshee,ixfalia/banshee,mono-soc-2011/banshee,arfbtwn/banshee,ixfalia/banshee,directhex/banshee-hacks,Carbenium/banshee,GNOME/banshee,Dynalon/banshee-osx,babycaseny/banshee,mono-soc-2011/banshee,arfbtwn/banshee,allquixotic/banshee-gst-sharp-work,stsundermann/banshee,Carbenium/banshee,GNOME/banshee,Dynalon/banshee-osx,mono-soc-2011/banshee,babycaseny/banshee,Dynalon/banshee-osx,directhex/banshee-hacks,arfbtwn/banshee,directhex/banshee-hacks,ixfalia/banshee,Dynalon/banshee-osx,allquixotic/banshee-gst-sharp-work,arfbtwn/banshee,babycaseny/banshee,GNOME/banshee