update lpc builds to use platformios ldf limited to strict mode

need to identify why incompatible libraries are still included without specifically disallowing them

platformio.ini

 # debug options for backtrace
 #  -funwind-tables
 #  -mpoke-function-name
-lib_ldf_mode      = off
+lib_ignore        = Adafruit NeoPixel
+lib_ldf_mode      = chain+
+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
 # debug options for backtrace
 #  -funwind-tables
 #  -mpoke-function-name
-lib_ldf_mode      = off
+lib_ignore        = Adafruit NeoPixel
+lib_ldf_mode      = chain+
+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