Add OpenCV in ppc #1174

Job	Run time
python-lint	3s
clang-format	7s
ubuntu-gcc-build	35m 22s
windows-msvc-build	37m 1s
ubuntu-clang-build	36m 28s
macos-clang-build	34m 39s
windows-clang-build	36m 51s
macos-clang-build-extended	1m 39s
ubuntu-gcc-build-extended	57s
ubuntu-clang-build-extended	1s
ubuntu-clang-sanitizer-build	1s
ubuntu-gcc-build-codecov	1s
ubuntu-clang-sanitizer-build-extended	1s
windows-clang-build-extended	1s
windows-msvc-build-extended	1s
ubuntu-gcc-build-perf-stats	1s
	3h 3m 14s

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