docs: Run tbl preprocessor in manpage-check rule. #1816

Job	Run time
dpdk gcc	6s
osx clang --disable-ssl	4m 2s
linux deb no dpdk	6m 58s
linux gcc --disable-ssl	3m 50s
linux clang --disable-ssl	3m 53s
linux gcc c99	3m 50s
linux clang c99	3m 45s
linux gcc test	10m 27s
linux clang test asan	19m 12s
linux clang test ubsan	10m 56s
linux gcc test --enable-shared	14m 7s
linux clang test --enable-shared	17m 9s
linux gcc test dpdk	12m 30s
linux clang test dpdk	9m 54s
linux gcc test -ljemalloc	11m 18s
linux clang test -ljemalloc	9m 54s
linux gcc --enable-afxdp	3m 13s
linux clang --enable-afxdp	3m 26s
linux gcc dpdk --enable-shared	5m 25s
linux clang dpdk --enable-shared	4m 44s
linux gcc dpdk-shared	3m 43s
linux clang dpdk-shared	3m 31s
linux gcc dpdk-shared --enable-shared	4m 39s
linux clang dpdk-shared --enable-shared	4m 6s
linux gcc m32 --disable-ssl	3m 28s
	2h 58m 6s

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