remove duplicate symbol version script entries

GNU ld ignores duplicates, but lld produces a warning.

Differential Revision:	https://reviews.llvm.org/D35121

llvm-svn: 307399

openmp/runtime/src/exports_so.txt

@@ -84,10 +84,7 @@ VERSION {
         __kmp_acquire_tas_lock;
         __kmp_acquire_ticket_lock;
         __kmp_fork_call;
-        __kmp_get_reduce_method;
         __kmp_invoke_microtask;
-        __kmp_itt_fini_ittlib;
-        __kmp_itt_init_ittlib;
 #if KMP_USE_MONITOR
         __kmp_launch_monitor;
         __kmp_reap_monitor;