Cygwin: testsuite: Update mutex tests for changed default mutex type

Default mutex type is PTHREAD_MUTEX_NORMAL.

Attempting to unlock an unowned mutex of that type is specified as
undefined behaviour, not returning EPERM.

mutex7e verfies that attempting to unlock an unowned mutex of type
PTHREAD_MUTEX_ERRORCHECK returns EPERM.

winsup/testsuite/winsup.api/pthread/mutex5.c

@@ -23,7 +23,7 @@ main()
     {
       assert(pthread_mutexattr_init(&mxAttr) == 0);
       assert(pthread_mutexattr_gettype(&mxAttr, &mxType) == 0);
-      assert(mxType == PTHREAD_MUTEX_ERRORCHECK);
+      assert(mxType == PTHREAD_MUTEX_NORMAL);
     }
 
   return 0;

winsup/testsuite/winsup.api/pthread/mutex7.c

@@ -2,7 +2,7 @@
  * mutex7.c
  *
  * Test the default (type not set) mutex type.
- * Should be the same as PTHREAD_MUTEX_ERRORCHECK.
+ * Should be the same as PTHREAD_MUTEX_NORMAL.
  * Thread locks then trylocks mutex (attempted recursive lock).
  * The thread should lock first time and EBUSY second time.
  *
@@ -25,7 +25,6 @@ void * locker(void * arg)
   assert(pthread_mutex_trylock(&mutex) == EBUSY);
   lockCount++;
   assert(pthread_mutex_unlock(&mutex) == 0);
-  assert(pthread_mutex_unlock(&mutex) == EPERM);
 
   return 0;
 }

winsup/testsuite/winsup.api/pthread/mutex7d.c

@@ -2,7 +2,7 @@
  * mutex7d.c
  *
  * Test the default (type not set) mutex type.
- * Should be the same as PTHREAD_MUTEX_ERRORCHECK.
+ * Should be the same as PTHREAD_MUTEX_NORMAL.
  * Thread locks then trylocks mutex (attempted recursive lock).
  * The thread should lock first time and EBUSY second time.
  *
@@ -25,7 +25,6 @@ void * locker(void * arg)
   assert(pthread_mutex_trylock(&mutex) == EBUSY);
   lockCount++;
   assert(pthread_mutex_unlock(&mutex) == 0);
-  assert(pthread_mutex_unlock(&mutex) == EPERM);
 
   return 0;
 }

winsup/testsuite/winsup.api/pthread/mutex7n.c

@@ -29,7 +29,6 @@ void * locker(void * arg)
   assert(pthread_mutex_trylock(&mutex) == EBUSY);
   lockCount++;
   assert(pthread_mutex_unlock(&mutex) == 0);
-  assert(pthread_mutex_unlock(&mutex) == EPERM);
 
   return (void *) 555;
 }