Merge commit 'a6a750c7ef240b72ce01e9653343a0ddf247d196'

* commit 'a6a750c7ef240b72ce01e9653343a0ddf247d196':
  tests: Move all test programs to a subdirectory

Merged-by: Clément Bœsch <clement@stupeflix.com>

libavutil/tests/.gitignore

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+/adler32
+/aes
+/atomic
+/avstring
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+/blowfish
+/bprint
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+/cast5
+/color_utils
+/cpu
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+/hash
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+/murmur3
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+/parseutils
+/pca
+/pixdesc
+/pixelutils
+/random_seed
+/rational
+/ripemd
+/sha
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+/softfloat
+/tea
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+/twofish
+/utf8
+/xtea