tests: runtime: out_syslog: add test code

Signed-off-by: Takahiro Yamashita <[email protected]>

Author: nokute78

tests/runtime/CMakeLists.txt

@@ -74,6 +74,7 @@ if(FLB_IN_LIB)
   FLB_RT_TEST(FLB_OUT_RETRY            "out_retry.c")
   FLB_RT_TEST(FLB_OUT_SPLUNK           "out_splunk.c")
   FLB_RT_TEST(FLB_OUT_STDOUT           "out_stdout.c")
+  FLB_RT_TEST(FLB_OUT_SYSLOG           "out_syslog.c")
 
   if (FLB_RECORD_ACCESSOR)
     FLB_RT_TEST(FLB_OUT_STACKDRIVER      "out_stackdriver.c")