Turn PlatformIO LDF off for LPC176x builds (#12334)

platformio.ini

 # debug options for backtrace
 #  -funwind-tables
 #  -mpoke-function-name
-lib_ignore        = Adafruit NeoPixel
-lib_ldf_mode      = chain+
+lib_ldf_mode      = off
 lib_compat_mode   = strict
 extra_scripts     = Marlin/src/HAL/HAL_LPC1768/upload_extra_script.py
 src_filter        = ${common.default_src_filter} +<src/HAL/HAL_LPC1768>
 monitor_speed     = 250000
-lib_deps          = https://github.com/MarlinFirmware/U8glib-HAL/archive/dev.zip
+lib_deps          = Servo
+  LiquidCrystal
+  https://github.com/MarlinFirmware/U8glib-HAL/archive/dev.zip
   https://github.com/teemuatlut/TMCStepper.git
 
 [env:LPC1769]
 # debug options for backtrace
 #  -funwind-tables
 #  -mpoke-function-name
-lib_ignore        = Adafruit NeoPixel
-lib_ldf_mode      = chain+
+lib_ldf_mode      = off
 lib_compat_mode   = strict
 extra_scripts     = Marlin/src/HAL/HAL_LPC1768/upload_extra_script.py
 src_filter        = ${common.default_src_filter} +<src/HAL/HAL_LPC1768>
 monitor_speed     = 250000
-lib_deps          = https://github.com/MarlinFirmware/U8glib-HAL/archive/dev.zip
+lib_deps          = Servo
+  LiquidCrystal
+  https://github.com/MarlinFirmware/U8glib-HAL/archive/dev.zip
   https://github.com/teemuatlut/TMCStepper.git
 
 #