Disable presubmit for invalid defined check in ABSL code.

ABSL is trying to be -Wundef clean and sending a patch for these
macros seems overkill. They are used inside a __APPLE__ block with
this pattern:

#if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
#endif

Bug: None
Change-Id: I863d099dcc3a2588388afab24a61be89884b392b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1612913Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Mirko Bonadei <mbonadei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660995}

PRESUBMIT.py

@@ -3636,8 +3636,9 @@ def _CheckForInvalidIfDefinedMacrosInFile(input_api, f):
 def _CheckForInvalidIfDefinedMacros(input_api, output_api):
   """Check all affected files for invalid "if defined" macros."""
   bad_macros = []
+  skipped_paths = ['third_party/sqlite/', 'third_party/abseil-cpp/']
   for f in input_api.AffectedFiles():
-    if f.LocalPath().startswith('third_party/sqlite/'):
+    if any([f.LocalPath().startswith(path) for path in skipped_paths]):
       continue
     if f.LocalPath().endswith(('.h', '.c', '.cc', '.m', '.mm')):
       bad_macros.extend(_CheckForInvalidIfDefinedMacrosInFile(input_api, f))