Fixes:
 Running .../src/gdb/testsuite/gdb.base/catch-fork-kill.exp ...
 gdb compile failed, .../src/gdb/testsuite/gdb.base/catch-fork-kill.c: In function 'main':
 .../src/gdb/testsuite/gdb.base/catch-fork-kill.c:81:4: warning: implicit declaration of function 'wait' [-Wimplicit-function-declaration]
     wait (NULL);
     ^
gdb/testsuite/ChangeLog:
2016-03-01  Pedro Alves  <palves@redhat.com>
	* gdb.base/catch-fork-kill.c: Include <sys/wait.h>.
+2016-03-01  Pedro Alves  <palves@redhat.com>
+
+       * gdb.base/catch-fork-kill.c: Include <sys/wait.h>.
+
 2016-03-01  Yao Qi  <yao.qi@linaro.org>
 
        * gdb.arch/arm-disp-step.exp: Use standard_testfile and
 
 #include <stdlib.h>
 #include <unistd.h>
 #include <assert.h>
+#include <sys/wait.h>
 
 int fds[2] = { -1, -1 };