Add OpenCV in ppc #1176

Job	Run time
python-lint	4s
clang-format	8s
ubuntu-gcc-build	24m 44s
ubuntu-clang-build	29m 9s
windows-clang-build	1h 57m 56s
macos-clang-build	27m 56s
windows-msvc-build	23m 35s
windows-msvc-build-extended	36m 23s
ubuntu-gcc-build-extended	28m 21s
macos-clang-build-extended	24m 18s
ubuntu-clang-sanitizer-build	24m 23s
ubuntu-clang-build-extended	30m 8s
ubuntu-clang-sanitizer-build-extended	24m 43s
ubuntu-gcc-build-codecov	24m 35s
windows-clang-build-extended	1s
ubuntu-gcc-build-perf-stats	1s
	6h 56m 25s

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