cmake don't build param "c" files and remove param defines

- these aren't actual source code

platforms/posix/src/px4/common/gtest_runner/gtest_functional_main.cpp

@@ -35,6 +35,8 @@
 
 #include <uORB/Subscription.hpp>
 
+#include <lib/parameters/param.h>
+
 int main(int argc, char **argv)
 {
 	testing::InitGoogleTest(&argc, argv);