* nongnu/packages/steam-client.scm (nongnu-container->package)
(make-container-internal): Remove auto generated asound.conf.
(make-internal-script): Use inline asound.conf and add --asound32 command line
flag to set it as 32-bit instead of 64-bit.
(steam-client, steam): Add new .desktop file for 32-bit asound.conf.