acl_profiler_test: fix undefined behaviour with putenv()

The buffer passed to putenv() becomes part of the environment. It is
the caller's responsibility to keep the buffer alive as long as the
environment variable is not modified by a subsequent invocation.

Signed-off-by: Peter Colberg <peter.colberg@intel.com>

test/acl_profiler_test.cpp

@@ -50,8 +50,8 @@ MT_TEST_GROUP(acl_profile) {
   enum { MAX_DEVICES = 100, m_num_devices_in_context = 3 };
   void setup() {
     if (threadNum() == 0) {
-      char profile_runtime_env_var[] = "ACL_RUNTIME_PROFILING_ACTIVE=1";
-      char profiler_timer_env_var[] = "ACL_PROFILE_TIMER=1";
+      static char profile_runtime_env_var[] = "ACL_RUNTIME_PROFILING_ACTIVE=1";
+      static char profiler_timer_env_var[] = "ACL_PROFILE_TIMER=1";
 #ifdef _WIN32
       _putenv(profile_runtime_env_var);
       _putenv(profiler_timer_env_var);