fix make sequence for coverity_scan.

.travis.yml

@@ -100,7 +100,7 @@ matrix:
 
         # Commands to prepare for build_command
         # ** likely specific to your build **
-        build_command_prepend: cmake ..
+        build_command_prepend: cmake .
 
         # The command that will be added as an argument to "cov-build" to compile your project for analysis,
         # ** likely specific to your build **