Add miniz library to third_party, use it on Windows

third_party/miniz/miniz.gyp

Index: third_party/miniz/miniz.gyp
diff --git a/third_party/miniz/miniz.gyp b/third_party/miniz/miniz.gyp
new file mode 100644
index 0000000000000000000000000000000000000000..bd28bee825ca6d65d9765f009208c9871c699323
--- /dev/null
+++ b/third_party/miniz/miniz.gyp
@@ -0,0 +1,36 @@
+{
+  'targets': [

[mtklein, 2014/08/13 17:57:09]

Do we ever build this library?  Doesn't miniz.c just get included into
SkFlate.cpp?

[hal.canary, 2014/08/13 18:04:24]

Since we define MINIZ_HEADER_FILE_ONLY, most of the .c file is ignored when
included.

+    {
+      'target_name': 'miniz',
+      'type': 'static_library',
+      'direct_dependent_settings': {
+        'defines': [
+          'MINIZ_INCLUDE="miniz.c"',
+          'MINIZ_HEADER_FILE_ONLY',
+          'MINIZ_NO_STDIO',
+          'MINIZ_NO_TIME',
+          'MINIZ_NO_ARCHIVE_APIS',
+          'MINIZ_NO_ARCHIVE_WRITING_APIS',
+        ],
+        'include_dirs': [ '.', ],
+      },
+      'defines': [
+        'MINIZ_NO_STDIO',
+        'MINIZ_NO_TIME',
+        'MINIZ_NO_ARCHIVE_APIS',
+        'MINIZ_NO_ARCHIVE_WRITING_APIS',
+      ],
+      'conditions': [
+        ['OS != "win"',
+          {
+            'cflags': [
+              '-fno-strict-aliasing',
+              '-Wno-unused-function',
+            ],
+          }
+        ],
+      ],
+      'sources': [ 'miniz.c', ],
+    }
+  ]
+}