Adding more warning in core

gyp/core.gyp

 # Core Skia library code.
 {
   'targets': [
     {
       'target_name': 'core',
       'product_name': 'skia_core',
       'type': 'static_library',
       'standalone_static_library': 1,
       'msvs_guid': 'B7760B5E-BFA8-486B-ACFD-49E3A6DE8E76',
 
@@ skipping 11 matching lines @@
         '../include/xml',
         '../src/core',
         '../src/image',
       ],
       'sources': [
         'core.gypi', # Makes the gypi appear in IDEs (but does not modify the build).
       ],
       'msvs_disabled_warnings': [4244, 4267,4345, 4390, 4554, 4800],
       'conditions': [
         [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris"]', {
-          'cflags': [
-            '-Wno-unused',
-            '-Wno-unused-function',
-          ],
           'link_settings': {
             'libraries': [
               '-lpthread',
             ],
           },
         }],
         [ 'skia_os == "mac"', {
           'include_dirs': [
             '../include/utils/mac',
             '../third_party/freetype/include/**',
@@ skipping 89 matching lines @@
       ],
     },
   ],
 }
 
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