refactor gyp to isolate freetype usage

gyp/freetype.gyp

 {
   'targets': [
     {
       'target_name': 'freetype',
+      'type': 'none',
+      'conditions': [
+        [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris", "chromeos"]', {
+          'direct_dependent_settings': {
+            'include_dirs' : [
+              '/usr/include/freetype2',
+            ],
+            'link_settings': {
+              'libraries': [
+                '-lfreetype',
+              ],
+              'defines': [
+                #The font host requires at least FreeType 2.3.0 at runtime.
+                'SK_FONTHOST_FREETYPE_RUNTIME_VERSION=0x020300',\
+                'SK_CAN_USE_DLOPEN=1',
+              ],
+            }
+          },
+        }],
+        [ 'skia_os in ["android", "nacl"]', {
+          'dependencies': [
+            'freetype_static'
+          ],
+          'export_dependent_settings': [
+            'freetype_static'
+          ],
+          'direct_dependent_settings': {
+            'defines': [
+              # Both Android and NaCl provide at least FreeType 2.4.0
+              'SK_FONTHOST_FREETYPE_RUNTIME_VERSION=0x020400',
+              'SK_CAN_USE_DLOPEN=0',
+            ],
+          },
+        }],
+      ],
+    },
+    {
+      'target_name': 'freetype_static',
       'type': 'static_library',
       'standalone_static_library': 1,
       'sources': [
         # base components (required)
         '../third_party/externals/freetype/src/base/ftsystem.c',
         '../third_party/externals/freetype/src/base/ftinit.c',
         '../third_party/externals/freetype/src/base/ftdebug.c',
         '../third_party/externals/freetype/src/base/ftbase.c',
 
         '../third_party/externals/freetype/src/base/ftbbox.c',       # recommended, see <freetype/ftbbox.h>
@@ skipping 62 matching lines @@
       ],
     },
   ],
 }
 
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