_MINIX fixup

test/test42.c

@@ -1,5 +1,4 @@
 /* Tests for MINIX3 ptrace(2) - by D.C. van Moolenbroek */
-#define _POSIX_SOURCE 1
 #include <setjmp.h>
 #include <stdlib.h>
 #include <stdio.h>

test/test43.c

@@ -1,5 +1,4 @@
 /* Tests for MINIX3 realpath(3) - by Erik van der Kouwe */
-#define _POSIX_SOURCE 1
 #include <assert.h>
 #include <dirent.h>
 #include <errno.h>

test/test50.c

@@ -1,5 +1,4 @@
 /* Tests for truncate(2) call family - by D.C. van Moolenbroek */
-#define _POSIX_SOURCE 1
 #include <sys/stat.h>
 #include <sys/param.h>
 #include <unistd.h>

test/test52.c

@@ -1,4 +1,3 @@
-#define _POSIX_SOURCE 1
 #include <unistd.h>
 #include <stdio.h>
 #include <stdlib.h>