Update Android FreeType version.

Update FreeType to a newer version. Because this caused issues in
finding the correct ftoptions.h and ftmodule.h [1], be sure to state
the ones we want explicitly.

This also add gzip.c which is needed for WOFF support [2].

[1] FreeType "Simplify header file hierarchy."
    fae382076409db198dfbff36ac4cbb97b05b30a1

[2] FreeType "[gzip] New function `FT_Gzip_Uncompress'."
    dc240524ff31891a442225430b28e9620c1fa89f

Review URL: https://codereview.chromium.org/833103004
diff --git a/DEPS b/DEPS
index 5645144..c903b91 100644
--- a/DEPS
+++ b/DEPS
@@ -10,7 +10,7 @@
 
   "third_party/externals/angle2"  : "https://chromium.googlesource.com/angle/angle.git@7258e30c8b4dd42b779f26f94eea91fc0ff3a118",
   "third_party/externals/cmake"   : "https://cmake.googlesource.com/cmake.git@v3.3.1",
-  "third_party/externals/freetype": "https://skia.googlesource.com/third_party/freetype2.git@VER-2-5-0-1",
+  "third_party/externals/freetype": "https://skia.googlesource.com/third_party/freetype2.git@6a19a7d332c5446542196e5aeda0ede109ef097b",
   "third_party/externals/gyp"     : "https://chromium.googlesource.com/external/gyp.git@08429da7955a98ef764fafa223dd7de73f654b2d",
   "third_party/externals/harfbuzz": "https://skia.googlesource.com/third_party/harfbuzz.git@0.9.35",
   "third_party/externals/jsoncpp" : "https://chromium.googlesource.com/external/jsoncpp/jsoncpp.git@1afff032c83e26ddf7f2776e8b43de5ad666c1fa",