[2.0.x][LPC176x][Build] Force single precision constants, disable freestanding (#10892)

Marlin/src/HAL/HAL_LPC1768/lpc1768_flag_script.py

                     "-mcpu=cortex-m3",
                     "-mthumb",
 
-                    "-ffreestanding",
                     "-fsigned-char",
                     "-fno-move-loop-invariants",
                     "-fno-strict-aliasing",
+                    "-fsingle-precision-constant",
 
                     "--specs=nano.specs",
                     "--specs=nosys.specs",

platformio.ini

 lib_deps          = CMSIS-LPC1768
   https://github.com/MarlinFirmware/U8glib-HAL/archive/dev.zip
   TMC2130Stepper@>=2.2.1
-extra_scripts     = Marlin/src/HAL/HAL_LPC1768/lpc1768_flag_script.py, Marlin/src/HAL/HAL_LPC1768/upload_extra_script.py
+extra_scripts     = Marlin/src/HAL/HAL_LPC1768/debug_extra_script.py, Marlin/src/HAL/HAL_LPC1768/lpc1768_flag_script.py, Marlin/src/HAL/HAL_LPC1768/upload_extra_script.py
 src_filter        = ${common.default_src_filter}
 monitor_speed     = 250000
-
-#
-# LPC1768 (for debugging and development)
-#
-[env:LPC1768_debug_and_upload]
-# Segger JLink
-platform          = nxplpc
-#framework        = mbed
-board             = lpc1768
-board_build.f_cpu = 100000000L
-build_flags       = !python Marlin/src/HAL/HAL_LPC1768/lpc1768_flag_script.py
-  ${common.build_flags}
-  -DU8G_HAL_LINKS
-lib_ldf_mode      = off
-lib_extra_dirs    = frameworks
-lib_deps          = CMSIS-LPC1768
-  https://github.com/MarlinFirmware/U8glib-HAL/archive/dev.zip
-src_filter        = ${common.default_src_filter}
-extra_scripts     =  Marlin/src/HAL/HAL_LPC1768/debug_extra_script.py, Marlin/src/HAL/HAL_LPC1768/lpc1768_flag_script.py
-monitor_speed     = 250000
 debug_tool        = custom
 debug_server      =
   C:\Program Files (x86)\SEGGER\JLink_V618d\JLinkGDBServerCL.exe