remove more global includes

src/engine/rendergl.cc

@@ -1,5 +1,7 @@
 // rendergl.cpp: core opengl rendering stuff
 
+#include <ctime>
+
 #include <shared/gl.hh>
 
 #include "aa.hh"

src/engine/texture.cc

@@ -1,5 +1,7 @@
 // texture.cpp: texture slot management
 
+#include <ctime>
+
 #include "texture.hh"
 
 #include "command.hh" // identflags

src/shared/cube.hh

@@ -6,12 +6,6 @@
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <ctype.h>
-#include <stdarg.h>
-#include <limits.h>
-#include <float.h>
-#include <assert.h>
-#include <time.h>
 
 #include "tools.hh"
 #include "geom.hh"

src/shared/tools.cc

@@ -1,5 +1,7 @@
 // implementation of generic tools
 
+#include <ctime>
+
 #include "cube.hh"
 
 void *operator new(size_t size)