[OMPT] Remove test output from source tree

%s refers to the test file in the source tree. This was accidentally added in
r351197 / 2b46d30 ("[OMPT] Second chunk of final OMPT 5.0 interface updates").

Differential Revision: https://reviews.llvm.org/D58002

git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@353715 91177308-0d34-0410-b5e6-96231b3b80d8

runtime/test/ompt/tasks/explicit_task.c

@@ -1,4 +1,4 @@
-// RUN: %libomp-compile-and-run | %sort-threads | tee %s.out | FileCheck %s
+// RUN: %libomp-compile-and-run | %sort-threads | FileCheck %s
 // REQUIRES: ompt
 // UNSUPPORTED: gcc-4, gcc-5, gcc-6, gcc-7
 #define TEST_NEED_PRINT_FRAME_FROM_OUTLINED_FN