Drop utf8 tweaks in build files

.travis.yml

   #
 script:
   #
-  # Fix include path problem in platformio.ini, U8glib-HAL_ID1932/src/lib/u8g.h
-  #
-  - find Marlin/ -name "*.h" | while read a; do sed -e 's|clib/u8g.h|u8g.h|' -i "$a"; done
-  #
   # Backup pins_RAMPS.h
   #
   - cp Marlin/src/pins/pins_RAMPS.h Marlin/src/pins/pins_RAMPS.h.backup

platformio.ini

 build_flags = -fmax-errors=5
   -g
   -ggdb
-  -I${platformio.libdeps_dir}/U8glib-HAL_ID1932/src/lib/
 lib_deps =
   https://github.com/MarlinFirmware/U8glib-HAL/archive/dev.zip
   LiquidCrystal_I2C@1.1.2