Remove px68k

As of last buildbot update, px68k has been failing. @bparker06 said that px68k's cache might need updating. I see the px68k is already in the noccache recipe and guess this was the purpose to not use ccache for this core:
https://github.com/libretro/libretro-super/blob/master/recipes/windows/cores-windows-x64_seh-noccache#L3

<retrobot> px68k: [status: fail] [recipes/windows/cores-windows-x64_seh-generic] LOG: http://p.0bl.net/86789 Last good build: N/A
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retro-wertz 2019-02-03 13:08:09 +08:00 committed by GitHub
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commit f5e6686eaa
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@ -87,7 +87,6 @@ ppsspp libretro-ppsspp https://github.com/hrydgard/ppsspp.git master YES GENERIC
prboom libretro-prboom https://github.com/libretro/libretro-prboom.git master YES GENERIC Makefile .
prosystem libretro-prosystem https://github.com/libretro/prosystem-libretro.git master YES GENERIC Makefile .
puae libretro-uae https://github.com/libretro/libretro-uae.git master YES GENERIC Makefile .
px68k libretro-px68k https://github.com/libretro/px68k-libretro.git master YES GENERIC Makefile.libretro .
quicknes libretro-quicknes https://github.com/libretro/QuickNES_Core.git master YES GENERIC Makefile .
redream libretro-redream https://github.com/libretro/redream.git master YES GENERIC Makefile deps/libretro
reicast libretro-reicast https://github.com/libretro/reicast-emulator.git master YES GENERIC Makefile . HAVE_OIT=1