ioc: fix DBE_ARCHIVE handling w/ singlesource #881

Job	Run time
Linux CentOS 7	3m 34s
Linux fedora latest	4m 13s
Native Linux (WError)	5m 30s
Native Linux (libc++ debug)	6m 33s
Native Linux (c++17)	5m 3s
Cross mingw64 DLL	11m 35s
Cross mingw64 static	12m 12s
RTEMS5	14m 20s
Native Linux with clang	5m 1s
Native Linux with clang ubsan	5m 29s
Native Linux with libevent stable	4m 43s
Native Linux with 7.0.2	4m 45s
Native Linux with 3.15	4m 2s
Native Linux with 3.14	6m 31s
OSX	4m 17s
vs2019 DLL	7m 55s
vs2019 static	9m 14s
	1h 54m 57s

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