add Hide border option (#33)

* hide border
22 jobs for master in 10 minutes and 17 seconds (queued for 9 minutes and 40 seconds)
Status Name Job ID Coverage
  Build Shared
passed android-arm64-v8a #1008614

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passed android-armeabi-v7a #1008613

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passed android-x86 #1008616

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passed android-x86_64 #1008615

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passed libretro-build-ios-arm64 #1008617
macosx-packaging

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passed libretro-build-ios9 #1008618
macosx

00:00:15

passed libretro-build-linux-i686 #1008610

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passed libretro-build-linux-x64 #1008609

00:00:13

passed libretro-build-miyoo-arm32 #1008620

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passed libretro-build-osx-arm64 #1008612
macosx

00:00:12

passed libretro-build-osx-x64 #1008611
macosx

00:00:35

passed libretro-build-tvos-arm64 #1008619
macosx-packaging

00:00:14

passed libretro-build-windows-i686 #1008608

00:00:12

passed libretro-build-windows-x64 #1008607

00:00:13

 
  Build Static
passed libretro-build-ctr #1008621

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passed libretro-build-libnx-aarch64 #1008625

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passed libretro-build-ngc #1008622

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passed libretro-build-ps2 #1008626

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passed libretro-build-psp #1008627

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passed libretro-build-vita #1008628

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passed libretro-build-wii #1008623

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passed libretro-build-wiiu #1008624

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