🔨 Build scripts cleanup (#27157)

Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>

buildroot/share/PlatformIO/scripts/SAMD21_minitronics20.py

@@ -6,8 +6,7 @@ import pioutil
 if pioutil.is_pio_build():
     from os.path import join, isfile
     import shutil
-
-    Import("env")
+    env = pioutil.env
 
     mf = env["MARLIN_FEATURES"]
     rxBuf = mf["RX_BUFFER_SIZE"] if "RX_BUFFER_SIZE" in mf else "0"