Don't download source for libraries we'll use from MacPorts.
--- skia/DEPS.orig	2022-05-24 18:06:11.000000000 -0500
+++ skia/DEPS	2022-08-21 02:26:22.000000000 -0500
@@ -12,7 +12,6 @@
 deps = {
   "buildtools"                            : "https://chromium.googlesource.com/chromium/src/buildtools.git@b138e6ce86ae843c42a1a08f37903207bebcca75",
   "third_party/externals/angle2"          : "https://chromium.googlesource.com/angle/angle.git@8718783526307a3fbb35d4c1ad4e8101262a0d73",
-  "third_party/externals/brotli"          : "https://skia.googlesource.com/external/github.com/google/brotli.git@e61745a6b7add50d380cfd7d3883dd6c62fc2c71",
   "third_party/externals/d3d12allocator"  : "https://skia.googlesource.com/external/github.com/GPUOpen-LibrariesAndSDKs/D3D12MemoryAllocator.git@169895d529dfce00390a20e69c2f516066fe7a3b",
   # Dawn requires jinja2 and markupsafe for the code generator, tint for SPIRV compilation, and abseil for string formatting.
   # When the Dawn revision is updated these should be updated from the Dawn DEPS as well.
@@ -23,18 +22,10 @@
   "third_party/externals/dng_sdk"         : "https://android.googlesource.com/platform/external/dng_sdk.git@c8d0c9b1d16bfda56f15165d39e0ffa360a11123",
   "third_party/externals/egl-registry"    : "https://skia.googlesource.com/external/github.com/KhronosGroup/EGL-Registry@a0bca08de07c7d7651047bedc0b653cfaaa4f2ae",
   "third_party/externals/emsdk"           : "https://skia.googlesource.com/external/github.com/emscripten-core/emsdk.git@fc645b7626ebf86530dbd82fbece74d457e7ae07",
-  "third_party/externals/expat"           : "https://chromium.googlesource.com/external/github.com/libexpat/libexpat.git@a28238bdeebc087071777001245df1876a11f5ee",
-  "third_party/externals/freetype"        : "https://github.com/aseprite/freetype2.git@f122349b937d7d2b0f8b72f46f60a082ca6006db",
-  "third_party/externals/harfbuzz"        : "https://chromium.googlesource.com/external/github.com/harfbuzz/harfbuzz.git@8d1b000a3edc90c12267b836b4ef3f81c0e53edc",
   "third_party/externals/highway"         : "https://chromium.googlesource.com/external/github.com/google/highway.git@424360251cdcfc314cfc528f53c872ecd63af0f0",
-  "third_party/externals/icu"             : "https://chromium.googlesource.com/chromium/deps/icu.git@a0718d4f121727e30b8d52c7a189ebf5ab52421f",
   "third_party/externals/imgui"           : "https://skia.googlesource.com/external/github.com/ocornut/imgui.git@55d35d8387c15bf0cfd71861df67af8cfbda7456",
   "third_party/externals/libgifcodec"     : "https://skia.googlesource.com/libgifcodec@fd59fa92a0c86788dcdd84d091e1ce81eda06a77",
-  "third_party/externals/libjpeg-turbo"   : "https://chromium.googlesource.com/chromium/deps/libjpeg_turbo.git@22f1a22c99e9dde8cd3c72ead333f425c5a7aa77",
   "third_party/externals/libjxl"          : "https://chromium.googlesource.com/external/gitlab.com/wg1/jpeg-xl.git@a205468bc5d3a353fb15dae2398a101dff52f2d3",
-  "third_party/externals/libpng"          : "https://skia.googlesource.com/third_party/libpng.git@386707c6d19b974ca2e3db7f5c61873813c6fe44",
-  "third_party/externals/libwebp"         : "https://chromium.googlesource.com/webm/libwebp.git@20ef03ee351d4ff03fc5ff3ec4804a879d1b9d5c",
-  "third_party/externals/microhttpd"      : "https://android.googlesource.com/platform/external/libmicrohttpd@748945ec6f1c67b7efc934ab0808e1d32f2fb98d",
   "third_party/externals/oboe"            : "https://chromium.googlesource.com/external/github.com/google/oboe.git@b02a12d1dd821118763debec6b83d00a8a0ee419",
   "third_party/externals/opengl-registry" : "https://skia.googlesource.com/external/github.com/KhronosGroup/OpenGL-Registry@14b80ebeab022b2c78f84a573f01028c96075553",
   "third_party/externals/piex"            : "https://android.googlesource.com/platform/external/piex.git@bb217acdca1cc0c16b704669dd6f91a1b509c406",
@@ -50,7 +41,6 @@
   "third_party/externals/vulkan-tools"    : "https://chromium.googlesource.com/external/github.com/KhronosGroup/Vulkan-Tools@fa288188b574d9eee31cd52c5432780b6a46a412",
   #"third_party/externals/v8"              : "https://chromium.googlesource.com/v8/v8.git@5f1ae66d5634e43563b2d25ea652dfb94c31a3b4",
   "third_party/externals/wuffs"           : "https://skia.googlesource.com/external/github.com/google/wuffs-mirror-release-c.git@600cd96cf47788ee3a74b40a6028b035c9fd6a61",
-  "third_party/externals/zlib"            : "https://chromium.googlesource.com/chromium/src/third_party/zlib@c876c8f87101c5a75f6014b0f832499afeb65b73",
 
   "../src": {
     "url": "https://chromium.googlesource.com/chromium/src.git@91a2fd838a6a7ee5c442f5b61945e3cdc6c78649",