Fix missing function declarations when building tests

Fix these compiler warnings by declaring test_exit() and test_main() regardless of whether TEST_NO_WRAPPERS is defined:

test-cmdline.c: In function ‘send_ioctl’:
test-cmdline.c:268:2: warning: implicit declaration of function ‘test_exit’ [-Wimplicit-function-declaration]
test_exit(0);
^
test-common.c: In function ‘test_cmdline’:
test-common.c:361:21: warning: implicit declaration of function ‘test_main’ [-Wimplicit-function-declaration]

  rc = rc ? rc - 1 : test_main(argc, argv);
                     ^

---
These warnings are longstanding so I'm not sure why I didn't notice them before! I've applied this post-4.2.

Ben.

 internal.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

index 444810d..156770c 100644
@@ -132,10 +132,11 @@ struct cmd_expect {
 int test_ioctl(const struct cmd_expect *expect, void *cmd);
 #define TEST_IOCTL_MISMATCH (-2)
 
-#ifndef TEST_NO_WRAPPERS
 int test_main(int argc, char **argp);
-#define main(...) test_main(__VA_ARGS__)
 void test_exit(int rc) __attribute__((noreturn));
+
+#ifndef TEST_NO_WRAPPERS
+#define main(...) test_main(__VA_ARGS__)
 #undef exit
 #define exit(rc) test_exit(rc)
 void *test_malloc(size_t size);

Ben Hutchings
If the facts do not conform to your theory, they must be disposed of.