m4: Replace obsolete AC_ERROR with AC_MSG_ERROR. #148

Job	Run time
linux rpm fedora	10m 15s
osx clang --disable-ssl	5m 18s
dpdk gcc	4m 22s
linux gcc --disable-ssl	2m 47s
linux clang --disable-ssl	2m 46s
linux gcc test -500	28m 36s
linux gcc test 501-1000	12m 29s
linux gcc test 1001-	7m 25s
linux clang test sanitizers -300	17m 56s
linux clang test sanitizers 301-600	31m 26s
linux clang test sanitizers 601-900	15m 56s
linux clang test sanitizers 901-1200	9m 33s
linux clang test sanitizers 1201-	9m 26s
linux gcc test -ljemalloc -500	28m 28s
linux gcc test -ljemalloc 501-1000	13m 43s
linux gcc test -ljemalloc 1001-	6m 35s
linux gcc system-test-dpdk dpdk -100	16m 53s
linux gcc system-test-dpdk dpdk 101-200	21m 34s
linux gcc system-test-dpdk dpdk 201-	23m 28s
linux gcc system-test-userspace -100	16m 4s
linux gcc system-test-userspace 101-200	21m 28s
linux gcc system-test-userspace 201-	21m 34s
linux gcc system-test -100	16m 10s
linux gcc system-test 101-200	21m 15s
linux gcc system-test 201-	25m 23s
linux clang system-test sanitizers -100	19m 20s
linux clang system-test sanitizers 101-200	24m 15s
linux clang system-test sanitizers 201-	28m 59s
linux x86 gcc --disable-ssl	3m 18s
	7h 46m 42s

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