Cleanup unused variable.

[AndreyChurbanov]

Summary

This patch fixes problem raised in post-review comments of the https://reviews.llvm.org/D65285.

Developers of ittnotify confirmed that dll_path_ptr field of the __itt_global structure is never used by ittnotify library, so it is safe to remove the dll_path array.

[Hahnfeld]

Thanks, that's even easier than a pointer to NULL :)

runtime/src/thirdparty/ittnotify/ittnotify_static.cpp

 #include "ittnotify_static.h"
     {NULL, NULL, NULL, NULL, __itt_group_none}
 };
 
 #if ITT_PLATFORM==ITT_PLATFORM_WIN && KMP_MSVC_COMPAT
 #pragma warning(pop)
 #endif /* ITT_PLATFORM==ITT_PLATFORM_WIN */
 
-static char dll_path[PATH_MAX] = { 0 };
-
 /* static part descriptor which handles. all notification api attributes. */
 __itt_global _N_(_ittapi_global) = {
     ITT_MAGIC,                                     /* identification info */
     ITT_MAJOR, ITT_MINOR, API_VERSION_BUILD,       /* version info */
     0,                                             /* api_initialized */
     0,                                             /* mutex_initialized */
     0,                                             /* atomic_counter */
     MUTEX_INITIALIZER,                             /* mutex */
     NULL,                                          /* dynamic library handle */
     NULL,                                          /* error_handler */
-    (const char**)&dll_path,                       /* dll_path_ptr */
+    NULL,                                          /* dll_path_ptr */
     (__itt_api_info*)&api_list,                    /* api_list_ptr */
     NULL,                                          /* next __itt_global */
     NULL,                                          /* thread_list */
     NULL,                                          /* domain_list */
     NULL,                                          /* string_list */
     __itt_collection_normal,                       /* collection state */
     NULL                                          /* counter_list */
 };