python: Use build to generate PEP517 compatible archives. #2267

Job	Run time
osx clang --disable-ssl	3m 56s
linux gcc --disable-ssl	3m 23s
linux clang --disable-ssl	3m 33s
linux gcc c99	3m 25s
linux clang c99	3m 22s
linux gcc test 3.16	11m 15s
linux clang test 3.16 asan	16m 44s
linux gcc test --enable-shared	14m 20s
linux clang test --enable-shared	13m 20s
linux gcc test dpdk	12m 44s
linux clang test dpdk	10m 30s
linux gcc test -ljemalloc	10m 12s
linux clang test -ljemalloc	10m 10s
linux gcc 5.8 5.5 5.4 4.19	7m 32s
linux clang 5.8 5.5 5.4 4.19	7m 34s
linux gcc 4.14 4.9 4.4 3.16	8m 1s
linux clang 4.14 4.9 4.4 3.16	7m 59s
linux gcc afxdp 5.3	4m 12s
linux clang afxdp 5.3	3m 49s
linux gcc dpdk --enable-shared	5m 39s
linux clang dpdk --enable-shared	5m 30s
linux gcc dpdk-shared	3m 30s
linux clang dpdk-shared	4m 21s
linux gcc dpdk-shared --enable-shared	6m 10s
linux clang dpdk-shared --enable-shared	4m 4s
linux gcc m32 --disable-ssl	3m 18s
linux gcc deb	8m 40s
	3h 17m 13s

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