create opk during build

Signed-off-by: Michel-FK <michel.stempin@funkey-project.com>

FunKey/package/mednafen/opk/gamegear/gamegear.funkey-s.desktop

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+[Desktop Entry]
+Type=Application
+Name=Game Gear
+Comment=Game Gear Emulator
+Icon=gamegear
+Exec=/usr/games/launchers/gamegear_launch.sh
+Terminal=false
+X-OD-NeedsDownscaling=true
+Categories=emulators;
+selectorbrowser=true
+SelectorDir=/mnt/Game Gear
+SelectorFilter=zip,ZIP,gg,GG

FunKey/package/mednafen/opk/lynx/lynx.funkey-s.desktop

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+[Desktop Entry]
+Type=Application
+Name=Lynx
+Comment=Atari Lynx Emulator
+Icon=lynx
+Exec=/usr/games/launchers/lynx_launch.sh
+Terminal=false
+X-OD-NeedsDownscaling=true
+Categories=emulators;
+selectorbrowser=true
+SelectorDir=/mnt/Atari lynx
+SelectorFilter=zip,ZIP,lnx,LNX

FunKey/package/mednafen/opk/ngp/ngp.funkey-s.desktop

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+[Desktop Entry]
+Type=Application
+Name=Neo Geo
+Comment=Neo Geo Pocket Emulator
+Icon=ngp
+Exec=/usr/games/launchers/ngp_launch.sh
+Terminal=false
+X-OD-NeedsDownscaling=true
+Categories=emulators;
+selectorbrowser=true
+SelectorDir=/mnt/Neo Geo Pocket
+SelectorFilter=zip,ZIP,ngp,NGP

FunKey/package/mednafen/opk/pce/pce.funkey-s.desktop

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+[Desktop Entry]
+Type=Application
+Name=PC Engine
+Comment=PCE-TurboGrafx Emulator
+Icon=pce
+Exec=/usr/games/launchers/pce_launch.sh
+Terminal=false
+X-OD-NeedsDownscaling=true
+Categories=emulators;
+selectorbrowser=true
+SelectorDir=/mnt/PCE-TurboGrafx
+SelectorFilter=zip,ZIP,pce,PCE,sgx,SGX

FunKey/package/mednafen/opk/wonderswan/wonderswan.funkey-s.desktop

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+[Desktop Entry]
+Type=Application
+Name=WonderSwan
+Comment=WonderSwan/WonderSwan Color Emulator
+Icon=wonderswan
+Exec=/usr/games/launchers/wonderswan_launch.sh
+Terminal=false
+X-OD-NeedsDownscaling=true
+Categories=emulators;
+selectorbrowser=true
+SelectorDir=/mnt/WonderSwan
+SelectorFilter=zip,ZIP,wsc,WSC