Merge branch 'develop' of https://github.com/ivankravets/platformio into develop

* 'develop' of https://github.com/ivankravets/platformio:
  Add separate examples for atmelsam platform
  Fix build flags for digix board

platformio/builder/scripts/atmelsam.py

@@ -102,7 +102,7 @@ env.Append(
 )
 
 
-if "due" in env.subst("$BOARD"):
+if "sam3x8e" in env.get("BOARD_OPTIONS", {}).get("build", {}).get("mcu", None):
     env.Append(
         CPPDEFINES=[
             "printf=iprintf"

platformio/builder/scripts/frameworks/arduino.py

@@ -272,7 +272,7 @@ libs.append(envsafe.BuildLibrary(
     join("$PLATFORMFW_DIR", "cores", "${BOARD_OPTIONS['build']['core']}")
 ))
 
-if "due" in env.subst("$BOARD"):
+if "sam3x8e" in BOARD_BUILDOPTS.get("mcu", None):
     env.Append(
         LIBPATH=[
             join("$PLATFORMFW_DIR", "variants",