Path cleanup, low impact changes (#5340)

* Low impact changes from path_cleanup branch.

This is a step towards minimizing the diff with path_cleanup branch.

* Update ecl.

* Revert matrix update.

* Revert ecl and matrix.

* Update sitl gazebo.

* Revert sitl_gazebo and matrix changes.

src/platforms/posix/main.cpp

@@ -419,3 +419,5 @@ int main(int argc, char **argv)
 
 	return OK;
 }
+
+/* vim: set noet fenc=utf-8 ff=unix sts=0 sw=4 ts=4 : */