Documentation: Update QEMU documentation URLs. #488

Job	Run time
osx clang --disable-ssl	1m 27s
linux gcc --disable-ssl	2m 4s
linux clang --disable-ssl	2m 21s
linux gcc c99	2m 3s
linux clang c99	2m 6s
linux gcc test 4.14	7m 41s
linux clang test 4.14 asan	12m 38s
linux gcc test --enable-shared	9m 50s
linux clang test --enable-shared	9m 54s
linux gcc test dpdk	13m 53s
linux clang test dpdk	13m 47s
linux gcc test -ljemalloc	7m 26s
linux clang test -ljemalloc	7m 21s
linux gcc 5.8 5.5 5.4 4.19	5m 32s
linux clang 5.8 5.5 5.4 4.19	5m 56s
linux gcc 4.14 4.9 4.4	3m 39s
linux clang 4.14 4.9 4.4	4m 7s
linux gcc afxdp 5.4	3m 3s
linux clang afxdp 5.4	2m 58s
linux gcc dpdk --enable-shared	9m 16s
linux clang dpdk --enable-shared	9m 32s
linux gcc dpdk-shared	8m 34s
linux clang dpdk-shared	8m 51s
linux gcc dpdk-shared --enable-shared	9m 28s
linux clang dpdk-shared --enable-shared	9m 1s
linux gcc m32 --disable-ssl	1m 58s
linux gcc deb	6m 27s
	3h 0m 53s

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