Enabled -Wstrict-prototypes and fixed warnings.

test/unit/hook.c

@@ -14,7 +14,7 @@ static uintptr_t arg_args_raw[4];
 static int call_count = 0;
 
 static void
-reset_args() {
+reset_args(void) {
 	arg_extra = NULL;
 	arg_type = 12345;
 	arg_result = NULL;
@@ -40,7 +40,7 @@ alloc_free_size(size_t sz) {
  * allocation scenarios.
  */
 static void
-be_reentrant() {
+be_reentrant(void) {
 	/* Let's make sure the tcache is non-empty if enabled. */
 	alloc_free_size(1);
 	alloc_free_size(1024);
@@ -77,7 +77,7 @@ expect_args_raw(uintptr_t *args_raw_expected, int nargs) {
 }
 
 static void
-reset() {
+reset(void) {
 	call_count = 0;
 	reset_args();
 }