⚡ optimize header file, now modules could generate smaller dynamic libs.

module/fib.cpp

@@ -1,5 +1,6 @@
 #include <iostream>
 #include "../nasal.h"
+#include "../nasal_gc.h"
 
 double fibonaci(double x){
     if(x<=2)

module/keyboard.cpp

@@ -1,4 +1,6 @@
 #include "../nasal.h"
+#include "../nasal_gc.h"
+#include <unistd.h>
 #include <iostream>
 #ifdef _WIN32
 #include <conio.h>

module/nasocket.cpp

@@ -1,4 +1,6 @@
 #include "../nasal.h"
+#include "../nasal_gc.h"
+#include <unistd.h>
 
 #ifdef _WIN32
 #include <winsock.h>