Font data is const. Again.

glcdfont.c

@@ -10,7 +10,7 @@
  
 // Standard ASCII 5x7 font
 
-static unsigned char  font[] PROGMEM = {
+static const unsigned char font[] PROGMEM = {
         0x00, 0x00, 0x00, 0x00, 0x00,   
 	0x3E, 0x5B, 0x4F, 0x5B, 0x3E, 	
 	0x3E, 0x6B, 0x4F, 0x6B, 0x3E,