t/verify: Windows --output work-around

For a reason I do not understand Cygwin chokes when fio is given an
option like the following:

--output==/home/vincent.fu/fio-vpi/verify-test-20250505-172034/pattern_%o_vpi_10_vi_1024/3001/verify3001.output

This is the resulting error:

pattern: %o, verify_pattern_interval: 129, verify_interval: 1024
Test 3000 FAILED: [Errno 2] No such file or directory: '/home/vincent.fu/fio-vpi/verify-test-20250505-172034/pattern_%o_vpi_129_vi_1024/3000/verify3000.output' 3000
Test 3001 FAILED: [Errno 2] No such file or directory: '/home/vincent.fu/fio-vpi/verify-test-20250505-172034/pattern_%o_vpi_129_vi_1024/3001/verify3001.output' 3001
0 test(s) passed, 2 failed, 0 skipped

It's not the length because other paths are longer. Even if I escape the
% the error still occurs.

Work around this by simply using the filename instead of the entire
path. The job runs with the test directory as the current working
directory, so it's fine to just use the filename only.

Link: https://lore.kernel.org/r/20250508185832.3702-11-vincent.fu@samsung.com
Signed-off-by: Vincent Fu <vincent.fu@samsung.com>

Author: vincentkfu

t/verify.py

@@ -74,7 +74,7 @@ def setup(self, parameters):
             f"--ioengine={self.fio_opts['ioengine']}",
             f"--rw={self.fio_opts['rw']}",
             f"--verify={self.fio_opts['verify']}",
-            f"--output={self.filenames['output']}",
+            f"--output={os.path.basename(self.filenames['output'])}",
         ]
         for opt in VERIFY_OPT_LIST:
             if opt in self.fio_opts: