Some preserved PSP prototype builds were distributed as DVD-R images that contain the actual UMD data inside USER_L0.IMG and, for dual-layer titles, USER_L1.IMG. These images previously required manual extraction, renaming, or concatenation before PPSSPP could load them.
Add support for recognizing these DVD-R wrapper layouts and exposing the embedded UMD image through the normal disc loading path. This includes both ISO-based wrappers and UDF-based wrappers, so preserved prototype dumps can be opened directly without conversion.
This makes PPSSPP compatible with a wider range of preserved developer disc images without relying on title-specific handling.
The primary importance of this patch is to encourage preserving 1:1, perfect disc image dumps in the manner of Redump.org.
This patch has been successfully tested on the following DVD-R ISOs:
https://hiddenpalace.org/Rock_Band_Unplugged_(Dec_10,_2008_prototype)https://hiddenpalace.org/WipEout_Pulse_(May_4,_2007_prototype)https://hiddenpalace.org/Lara_Croft_Tomb_Raider:_Anniversary_(May_19,_2007_prototype)https://hiddenpalace.org/Heatseeker_(Jan_15,_2007_prototype)Fixes#15547.
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