tests: adapt posix tests to xtimer sleep/usleep

tests/posix_sleep/Makefile

 APPLICATION = posix_sleep
 include ../Makefile.tests_common
 
-BOARD_BLACKLIST := arduino-mega2560
-# arduino-mega2560: warning: iteration 2u invokes undefined behavior
-# [-Waggressive-loop-optimizations]
-
 USEMODULE += posix
 
-DISABLE_MODULE += auto_init
-
 include $(RIOTBASE)/Makefile.include

tests/posix_sleep/main.c

@@ -25,7 +25,7 @@ int main(void)
 {
     puts("usleep 1 x 1000*1000");
     for (int i = 0; i < 10; i++) {
-        useconds_t us = i*1000*1000;
+        useconds_t us = i*1000u*1000u;
         printf("calling usleep(%u)\n", (unsigned int) us);
         usleep(us);
         puts("wake up");

tests/pthread/Makefile

@@ -7,6 +7,4 @@ BOARD_BLACKLIST := arduino-mega2560
 USEMODULE += posix
 USEMODULE += pthread
 
-DISABLE_MODULE += auto_init
-
 include $(RIOTBASE)/Makefile.include

tests/pthread_cooperation/Makefile

@@ -7,6 +7,4 @@ BOARD_BLACKLIST := arduino-mega2560
 USEMODULE += posix
 USEMODULE += pthread
 
-DISABLE_MODULE += auto_init
-
 include $(RIOTBASE)/Makefile.include

tests/pthread_tls/Makefile

@@ -7,6 +7,4 @@ BOARD_BLACKLIST := arduino-mega2560
 USEMODULE += posix
 USEMODULE += pthread
 
-DISABLE_MODULE += auto_init
-
 include $(RIOTBASE)/Makefile.include