add Hide border option (#33)

* hide border
22 jobs for master in 1 minute and 36 seconds (queued for 7 seconds)
Status Name Job ID Coverage
  Build Shared
passed android-arm64-v8a #1007646

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passed android-armeabi-v7a #1007645

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passed android-x86 #1007648

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passed android-x86_64 #1007647

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passed libretro-build-ios-arm64 #1007649
macosx-packaging

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passed libretro-build-ios9 #1007650
macosx

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passed libretro-build-linux-i686 #1007642

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passed libretro-build-linux-x64 #1007641

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passed libretro-build-miyoo-arm32 #1007652

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passed libretro-build-osx-arm64 #1007644
macosx

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passed libretro-build-osx-x64 #1007643
macosx

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passed libretro-build-tvos-arm64 #1007651
macosx-packaging

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passed libretro-build-windows-i686 #1007640

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passed libretro-build-windows-x64 #1007639

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  Build Static
passed libretro-build-ctr #1007653

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passed libretro-build-libnx-aarch64 #1007657

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passed libretro-build-ngc #1007654

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passed libretro-build-ps2 #1007658

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passed libretro-build-psp #1007659

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passed libretro-build-vita #1007660

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passed libretro-build-wii #1007655

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passed libretro-build-wiiu #1007656

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