use python2 explicitly as python3 is default python now

Author: bugobliterator

modules/app_descriptor/module.mk

@@ -3,7 +3,7 @@ APP_DESCRIPTOR_MODULE_DIR := $(patsubst %/,%,$(dir $(lastword $(MAKEFILE_LIST)))
 .PHONY: INSERT_CRC
 POST_MAKE_ALL_RULE_HOOK: $(BUILDDIR)/$(PROJECT)-crc.bin
 $(BUILDDIR)/$(PROJECT)-crc.bin: $(BUILDDIR)/$(PROJECT).bin
-	python $(APP_DESCRIPTOR_MODULE_DIR)/crc_binary.py $< $@
+	python2 $(APP_DESCRIPTOR_MODULE_DIR)/crc_binary.py $< $@
 
 ifneq (,$(wildcard $(BOARD_DIR)/bootloader.bin))
 POST_MAKE_ALL_RULE_HOOK: $(BUILDDIR)/$(PROJECT)-combined.bin

modules/gps/module.mk

@@ -4,7 +4,7 @@ INCDIR += $(BUILDDIR)/ubx_msgs/include
 
 $(BUILDDIR)/ubx_msgs.mk: $(GPS_MODULE_DIR)/ubx_parser
 	rm -rf $(BUILDDIR)/ubx_msgs
-	python $(GPS_MODULE_DIR)/ubx_parser/ubx_pdf_csv_parser.py $(addprefix --build=,$(UBX_MESSAGES_ENABLED)) $(BUILDDIR)/ubx_msgs 
+	python2 $(GPS_MODULE_DIR)/ubx_parser/ubx_pdf_csv_parser.py $(addprefix --build=,$(UBX_MESSAGES_ENABLED)) $(BUILDDIR)/ubx_msgs 
 	find $(BUILDDIR)/ubx_msgs/src -name "*.c" | xargs echo CSRC += > $(BUILDDIR)/ubx_msgs.mk
 
 ifneq ($(MAKECMDGOALS),clean)

modules/uavcan/module.mk

@@ -12,7 +12,7 @@ INCDIR += $(BUILDDIR)/dsdlc/include
 
 $(BUILDDIR)/dsdlc.mk: $(foreach dsdl_dir,$(wildcard $(DSDL_NAMESPACE_DIRS)),$(shell find $(dsdl_dir)))
 	rm -rf $(BUILDDIR)/dsdlc
-	python $(UAVCAN_MODULE_DIR)/canard_dsdlc/canard_dsdlc.py $(addprefix --build=,$(MESSAGES_ENABLED)) $(DSDL_NAMESPACE_DIRS) $(BUILDDIR)/dsdlc
+	python2 $(UAVCAN_MODULE_DIR)/canard_dsdlc/canard_dsdlc.py $(addprefix --build=,$(MESSAGES_ENABLED)) $(DSDL_NAMESPACE_DIRS) $(BUILDDIR)/dsdlc
 	find $(BUILDDIR)/dsdlc/src -name "*.c" | xargs echo CSRC += > $(BUILDDIR)/dsdlc.mk
 
 ifneq ($(MAKECMDGOALS),clean)