m4: Fix check for Python 3.6 version. #2569

Job	Run time
linux deb no dpdk	4m 52s
libreswan (ubuntu-24.04)	5s
dpdk gcc (ubuntu-24.04)	4s
linux rpm fedora	4m 14s
osx clang --disable-ssl	1m 29s
clang-analyze-cache	10m 46s
linux gcc --disable-ssl	4m 24s
linux clang --disable-ssl	2m 38s
linux gcc c99	2m 47s
linux clang c99	2m 56s
linux gcc test	8m 26s
linux clang address,undefined test	16m 14s
linux gcc test --enable-shared	12m 54s
linux clang test --enable-shared	10m 59s
linux gcc check check-dpdk dpdk	18m 47s
linux clang check check-dpdk dpdk	18m 15s
linux gcc test -ljemalloc	10m 54s
linux clang test -ljemalloc	8m 45s
linux gcc --enable-afxdp	2m 44s
linux clang --enable-afxdp	2m 47s
linux gcc dpdk --enable-shared	3m 51s
linux clang dpdk --enable-shared	3m 44s
linux gcc dpdk-shared	2m 57s
linux clang dpdk-shared	3m 0s
linux gcc dpdk-shared --enable-shared	3m 50s
linux clang dpdk-shared --enable-shared	3m 45s
linux gcc m32 --disable-ssl	2m 47s
linux gcc check-ovsdb-cluster	6m 57s
linux gcc check-kernel -100	11m 9s
linux gcc check-kernel 100-	16m 19s
linux clang address,undefined check-kernel -100	13m 22s
linux clang address,undefined check-kernel 100-	18m 16s
linux gcc check-offloads -100	10m 18s
linux gcc check-offloads 100-	11m 15s
linux gcc dpdk check-system-userspace	12m 14s
linux clang address,undefined dpdk check-system-userspace	15m 24s
linux gcc dpdk check-system-tso	11m 58s
linux gcc dpdk check-afxdp	11m 49s
clang-analyze	11m 3s
	5h 18m 58s

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