Remove unnecessary includes

src/main.c

@@ -16,20 +16,15 @@ limitations under the License.
 
 #define VERSION "0.1"
 
-#include <math.h>
-#include <complex.h>
-#include <fftw3.h>
 #include <signal.h>
 #include <string.h>
 #include <stdlib.h>
-#include <stdbool.h>
 #include <errno.h>
 
 #include "constants.cpp"
 #include "driving.h"
 #include "init.h"
 #include "int_tools.h"
-#include "io.h"
 #include "navier-stokes.h"