Make landmines.py ignore eclipse gyp generator.

The eclipse gyp generator is used to generate eclipse project files, not
to actually build anything. Landmines should return early if the gyp
generator is eclipse rather than failing with the error "Unexpected
GYP_GENERATORS (eclipse)"

Review URL: https://codereview.chromium.org/236063002

git-svn-id: http://src.chromium.org/svn/trunk/src/build@263438 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

landmines.py

@@ -113,7 +113,7 @@ def process_options():
 def main():
   landmine_scripts = process_options()
 
-  if landmine_utils.builder() == 'dump_dependency_json':
+  if landmine_utils.builder() in ('dump_dependency_json', 'eclipse'):
     return 0
 
   for target in ('Debug', 'Release', 'Debug_x64', 'Release_x64'):