disabled change for AVR targets

Adafruit_GFX.cpp

@@ -1177,6 +1177,7 @@ void Adafruit_GFX::drawChar(int16_t x, int16_t y, unsigned char c,
       c++; // Handle 'classic' charset behavior
 
     startWrite();
+#ifndef __AVR__
       if (color != bg) { // faster opaque text
         setAddrWindow(x, y, 5*size_x, 7*size_y);
         for (int8_t j = 0; j < 7; j++) { // 7 lines
@@ -1188,7 +1189,9 @@ void Adafruit_GFX::drawChar(int16_t x, int16_t y, unsigned char c,
                 } // for each column
             } // repeat for each line of size_y
         } // for j
-      } else { // slower text which doesn't overwrite the background color
+      } else
+#endif // __AVR__
+      { // slower text which doesn't overwrite the background color
         for (int8_t i = 0; i < 5; i++) { // Char bitmap = 5 columns
           uint8_t line = pgm_read_byte(&font[c * 5 + i]);
           for (int8_t j = 0; j < 8; j++, line >>= 1) {