ipsec: Add support for using default crypto with Libreswan. #2573

Job	Run time
dpdk gcc (ubuntu-24.04)	5s
libreswan (ubuntu-24.04)	7s
linux rpm fedora	4m 24s
linux deb no dpdk	5m 2s
build oss-fuzz fuzzers	3m 1s
osx clang --disable-ssl	1m 30s
clang-analyze-cache	11m 43s
linux gcc --disable-ssl	2m 40s
linux clang --disable-ssl	2m 41s
linux gcc c99	2m 41s
linux clang c99	2m 40s
linux gcc test	9m 34s
linux clang address,undefined test	16m 22s
linux gcc test --enable-shared	11m 15s
linux clang test --enable-shared	10m 52s
linux gcc check check-dpdk dpdk	18m 44s
linux clang check check-dpdk dpdk	19m 11s
linux gcc test -ljemalloc	8m 57s
linux clang test -ljemalloc	8m 55s
linux gcc --enable-afxdp	3m 40s
linux clang --enable-afxdp	2m 41s
linux gcc dpdk --enable-shared	3m 58s
linux clang dpdk --enable-shared	3m 34s
linux gcc dpdk-shared	3m 5s
linux clang dpdk-shared	3m 1s
linux gcc dpdk-shared --enable-shared	3m 51s
linux clang dpdk-shared --enable-shared	3m 53s
linux gcc m32 --disable-ssl	2m 37s
linux gcc check-ovsdb-cluster	6m 52s
linux gcc check-kernel -100	10m 36s
linux gcc check-kernel 100-	17m 10s
linux clang address,undefined check-kernel -100	13m 1s
linux clang address,undefined check-kernel 100-	19m 53s
linux gcc check-offloads -100	9m 53s
linux gcc check-offloads 100-	12m 0s
linux gcc dpdk check-system-userspace	12m 19s
linux clang address,undefined dpdk check-system-userspace	15m 45s
linux gcc dpdk check-system-tso	12m 32s
linux gcc dpdk check-afxdp	12m 17s
clang-analyze	10m 47s
	5h 23m 49s

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