Added new example 23 to check mixed of communications #548

Job	Run time
linux-gnu-shared-ext-log	1m 43s
linux-gnu-shared-ext-nolog	1m 37s
linux-gnu-static-all-test	2m 52s
linux-gnu-shared-all-test	2m 4s
linux-gnu-shared-noext-nolog	2m 3s
linux-clang-shared-ext-log	2m 53s
linux-clang-shared-ext-nolog	1m 50s
linux-clang-static-all-test	2m 6s
linux-clang-shared-all-test	2m 19s
linux-clang-shared-noext-nolog	1m 48s
win-cygwin-shared-ext-log	8m 36s
win-cygwin-shared-ext-nolog	10m 56s
win-cygwin-static-all-test	11m 51s
win-cygwin-shared-all-test	11m 52s
win-cygwin-shared-noext-nolog	9m 31s
win-msvc-shared-ext-log	5m 46s
win-msvc-shared-ext-nolog	5m 24s
win-msvc-static-all-test	7m 45s
win-msvc-shared-all-test	7m 45s
win-msvc-shared-noext-log	5m 15s
win-msvc-shared-noext-nolog	5m 20s
	1h 51m 16s

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