Clean up warnings in pthread tests

I intend to move these into lib/libthr/tests/ and connect to kyua.  This
is a first step to address warnings emitted when building using standard
make infrastructure.

Reviewed by:	markj
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D34306

(cherry picked from commit ef135466)
(cherry picked from commit 7bfe5e45)
(cherry picked from commit 2e545745ce2ecbe966434fa5edc9b60d82b43c17)

tools/regression/pthread/cv_cancel1/cv_cancel1.c

@@ -32,14 +32,14 @@
 
 #define NLOOPS	10
 
-pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
-pthread_cond_t cv = PTHREAD_COND_INITIALIZER;
+static pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
+static pthread_cond_t cv = PTHREAD_COND_INITIALIZER;
 
-int wake;
-int stop;
+static int wake;
+static int stop;
 
-void *
-thr_routine(void *arg)
+static void *
+thr_routine(void *arg __unused)
 {
 	pthread_mutex_lock(&m);
 	while (wake == 0)
@@ -51,7 +51,8 @@ thr_routine(void *arg)
 	return (NULL);
 }
 
-int main(int argc, char **argv)
+int
+main(void)
 {
 	pthread_t td;
 	int i;

tools/regression/pthread/mutex_isowned_np/mutex_isowned_np.c

@@ -46,7 +46,7 @@ thread(void *arg)
 }
 
 int
-main(int argc, char *argv[])
+main(void)
 {
 	pthread_t thr;
 	pthread_mutex_t mtx;

tools/regression/pthread/unwind/Test.cpp

 /* $FreeBSD$ */
 
-int destructed;
-int destructed2;
+static int destructed;
+static int destructed2;
 
 class Test {
 public:
@@ -10,7 +10,7 @@ class Test {
 };
 
 void
-cleanup_handler(void *arg)
+cleanup_handler(void *arg __unused)
 {
 	destructed2 = 1;
 	printf("%s()\n", __func__);

tools/regression/pthread/unwind/catch_pthread_exit.cpp

@@ -5,10 +5,10 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-int caught;
+static int caught;
 
-void *
-thr_routine(void *arg)
+static void *
+thr_routine(void *arg __unused)
 {
 	try {
 		pthread_exit(NULL);

tools/regression/pthread/unwind/cond_wait_cancel.cpp

@@ -8,11 +8,11 @@
 
 #include "Test.cpp"
 
-pthread_mutex_t mtx;
-pthread_cond_t cv;
+static pthread_mutex_t mtx;
+static pthread_cond_t cv;
 
-void *
-thr(void *arg)
+static void *
+thr(void *arg __unused)
 {
 	Test t;
 

tools/regression/pthread/unwind/cond_wait_cancel2.cpp

@@ -13,10 +13,10 @@
 
 #include "Test.cpp"
 
-pthread_mutex_t mtx;
-pthread_cond_t cv;
+static pthread_mutex_t mtx;
+static pthread_cond_t cv;
 
-void f()
+static void f()
 {
 	Test t;
 
@@ -26,13 +26,13 @@ void f()
 	printf("Bug, thread shouldn't be here.\n");
 }
 
-void g()
+static void g()
 {
 	f();
 }
 
-void *
-thr(void *arg)
+static void *
+thr(void *arg __unused)
 {
 	pthread_cleanup_push(cleanup_handler, NULL);
 	g();

tools/regression/pthread/unwind/sem_wait_cancel.cpp

@@ -8,10 +8,10 @@
 
 #include "Test.cpp"
 
-sem_t sem;
+static sem_t sem;
 
-void *
-thr(void *arg)
+static void *
+thr(void *arg __unused)
 {
 	Test t;
 

tools/regression/pthread/unwind/thread_normal_exit.cpp

@@ -7,8 +7,8 @@
 
 #include "Test.cpp"
 
-void *
-thr_routine(void *arg)
+static void *
+thr_routine(void *arg __unused)
 {
 	Test test;