Use PTHREAD_STACK_MIN conditionally in a test

PTHREAD_STACK_MIN is not available on NetBSD as it's not
clear what the value shall be represented by this constant
on a multiplatform OS.

llvm-svn: 344034

compiler-rt/test/asan/TestCases/Posix/stack-use-after-return.cc

@@ -78,9 +78,11 @@ int main(int argc, char **argv) {
   pthread_attr_init(&attr);
   if (kStackSize > 0) {
     size_t desired_stack_size = kStackSize;
+#ifdef PTHREAD_STACK_MIN
     if (desired_stack_size < PTHREAD_STACK_MIN) {
       desired_stack_size = PTHREAD_STACK_MIN;
     }
+#endif
 
     int ret = pthread_attr_setstacksize(&attr, desired_stack_size);
     if (ret != 0) {