tests: add missing include for Makefile.tests_common

tests/conn_ip/Makefile

 APPLICATION = conn_ip
+include ../Makefile.tests_common
 
 BOARD ?= native
 

tests/cpp11_condition_variable/Makefile

 # name of your application
 APPLICATION = cpp11_condition_variable
+include ../Makefile.tests_common
 
 # If no BOARD is found in the environment, use this default:
 BOARD ?= native

tests/cpp11_mutex/Makefile

 # name of your application
 APPLICATION = cpp11_mutex
+include ../Makefile.tests_common
 
 # If no BOARD is found in the environment, use this default:
 BOARD ?= native

tests/cpp11_thread/Makefile

 # name of your application
 APPLICATION = cpp11_thread
+include ../Makefile.tests_common
 
 # If no BOARD is found in the environment, use this default:
 BOARD ?= native

tests/emb6/Makefile

 APPLICATION = emb6
+# overwrite board, do not set native as default
+BOARD ?= samr21-xpro
+include ../Makefile.tests_common
 
 FEATURES_REQUIRED = periph_gpio periph_spi  # for at86rf231
 
-BOARD ?= samr21-xpro
-
 RIOTBASE ?= $(CURDIR)/../..
 
 BOARD_INSUFFICIENT_MEMORY := msb-430h stm32f0discovery telosb weio z1

tests/fault_handler/Makefile

 # name of your application
 APPLICATION = fault_handler
+include ../Makefile.tests_common
 
 # If no BOARD is found in the environment, use this default:
 BOARD ?= native

tests/gnrc_ipv6_ext/Makefile

 # name of your application
 APPLICATION = gnrc_ipv6_ext
+include ../Makefile.tests_common
 
 # If no BOARD is found in the environment, use this default:
 BOARD ?= native

tests/gnrc_sixlowpan/Makefile

 # name of your application
 APPLICATION = gnrc_sixlowpan
+include ../Makefile.tests_common
 
 # If no BOARD is found in the environment, use this default:
 BOARD ?= native

tests/gnrc_sock_ip/Makefile

 APPLICATION = gnrc_sock_ip
+include ../Makefile.tests_common
 
 BOARD ?= native
 

tests/gnrc_sock_udp/Makefile

 APPLICATION = gnrc_sock_udp
+include ../Makefile.tests_common
 
 BOARD ?= native
 

tests/lwip/Makefile

 APPLICATION = lwip
-
+# overwrite board, do not set native as default
 BOARD ?= iotlab-m3
+include ../Makefile.tests_common
 
 RIOTBASE ?= $(CURDIR)/../..
 

tests/lwip_sock_ip/Makefile

 APPLICATION = lwip_sock_ip
-
 include ../Makefile.tests_common
 
 # lwIP's memory management doesn't seem to work on non 32-bit platforms at the

tests/malloc/Makefile

 # name of your application
 APPLICATION = malloc
+include ../Makefile.tests_common
 
 # If no BOARD is found in the environment, use this default:
 BOARD ?= native

tests/minimal/Makefile

 # name of your application
 APPLICATION = minimal
+include ../Makefile.tests_common
 
 # If no BOARD is found in the environment, use this default:
 BOARD ?= native

tests/msg_send_receive/Makefile

 # name of your application
 APPLICATION = msg_send_receive
-
 include ../Makefile.tests_common
 
 include $(RIOTBASE)/Makefile.include

tests/od/Makefile

 # name of your application
 APPLICATION = od
+include ../Makefile.tests_common
 
 # If no BOARD is found in the environment, use this default:
 BOARD ?= native

tests/periph_pwm/Makefile

-export APPLICATION = periph_pwm
+APPLICATION = periph_pwm
 include ../Makefile.tests_common
 
 FEATURES_REQUIRED = periph_pwm

tests/periph_rtt/Makefile

-export APPLICATION = periph_rtt
+APPLICATION = periph_rtt
 include ../Makefile.tests_common
 
 FEATURES_REQUIRED = periph_rtt

tests/periph_spi/Makefile

-export APPLICATION = periph_spi
+APPLICATION = periph_spi
 include ../Makefile.tests_common
 
 FEATURES_REQUIRED = periph_spi

tests/periph_timer/Makefile

-export APPLICATION = periph_timer
+APPLICATION = periph_timer
 include ../Makefile.tests_common
 
 FEATURES_REQUIRED = periph_timer