🔨 Build scripts cleanup (#27157)

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

buildroot/share/PlatformIO/scripts/STM32F103RC_fysetc.py

@@ -3,9 +3,8 @@
 #
 import pioutil
 if pioutil.is_pio_build():
-    from os.path import join
-    from os.path import expandvars
-    Import("env")
+    from os.path import join, expandvars
+    env = pioutil.env
 
     # Custom HEX from ELF
     env.AddPostAction(