testsuite: Always skip T15897

See #16193.

(cherry picked from commit f53ef1a7)

testsuite/tests/profiling/should_run/all.T

@@ -147,6 +147,9 @@ test('T12962', [], compile_and_run, [''])
 test('T14257', [], run_command, ['$MAKE -s --no-print-directory T14257'])
 
 test('T15897',
-     [extra_ways(['profasm']), only_ways(['profasm']), run_timeout_multiplier(2)],
+     [extra_ways(['profasm']), only_ways(['profasm']),
+      run_timeout_multiplier(2),
+      # Takes too long and is quite fragile (#15467, #16193)
+      skip],
      run_command,
      ['$MAKE -s --no-print-directory T15897'])