testsuite: Skip T17414 on Linux

It is typical for $TMP to be a small tmpfson Linux. This test will fail
in such cases since we must create a file larger than the filesystem.
See #17459.

libraries/base/tests/IO/all.T

@@ -136,5 +136,9 @@ test('T7853', normal, compile_and_run, [''])
 test('T17414',
      [when(wordsize(32), skip),
       when(opsys('mingw32'), fragile(17453)),
+      # It is common for tmpfs to be mounted to a small tmpfs on modern Linux
+      # distributions. This test needs to create a large file which will exceed the
+      # size of this filesystem onsequently we must skip it (see #17459).
+      when(opsys('linux'), skip),
       high_memory_usage],
      compile_and_run, [''])