Makefile: use hashbang in Python scripts

Execute Python scripts directly so they use
the specified interpreter + parameters
in the first line.

This aligns the behavior between running
Python scripts through make and manually in
the shell.

Makefile.embedded

@@ -39,7 +39,7 @@ login: $(SERIAL_DUMP_BIN)
 ### Targets using tools/motelist
 ###
 CONTIKI_NG_MOTELIST_DIR = $(CONTIKI_NG_TOOLS_DIR)/motelist
-CONTIKI_NG_MOTELIST = python $(CONTIKI_NG_MOTELIST_DIR)/motelist.py
+CONTIKI_NG_MOTELIST = $(CONTIKI_NG_MOTELIST_DIR)/motelist.py
 
 .PHONY: motelist-all
 

arch/platform/jn516x/Makefile.jn516x

@@ -180,7 +180,7 @@ LDFLAGS += -Wl,--defsym=_stack_origin=_ram_top
 
 ########################################################################
 
-MOTELIST = python $(CONTIKI)/tools/jn516x/mote-list.py
+MOTELIST = $(CONTIKI)/tools/jn516x/mote-list.py
 
 # Check if we are running under Windows
 ifeq ($(HOST_OS),Windows)

arch/platform/zoul/Makefile.zoul

@@ -47,7 +47,7 @@ MODULES += $(CONTIKI_NG_STORAGE_DIR)/cfs
 
 BSL = $(CONTIKI_NG_TOOLS_DIR)/cc2538-bsl/cc2538-bsl.py
 
-MOTES := $(shell python $(CONTIKI_NG_TOOLS_DIR)/motelist/motelist.py --omit-header \
+MOTES := $(shell $(CONTIKI_NG_TOOLS_DIR)/motelist/motelist.py --omit-header \
                  | grep $(MOTELIST_ZOLERTIA) | cut -f1 -d " ")
 
 ### If PORT is defined, override to keep backward compatibility