Add build/linux/unbundle files for projects in separate repos.

build/linux/unbundle/replace_gyp_files.py

Index: build/linux/unbundle/replace_gyp_files.py
diff --git a/build/linux/unbundle/replace_gyp_files.py b/build/linux/unbundle/replace_gyp_files.py
index 0a5f9fe0947fe7a3411331fc647f7113e59c16ac..59a6f8071f4ef81845df70ead841eb3f94249511 100755
--- a/build/linux/unbundle/replace_gyp_files.py
+++ b/build/linux/unbundle/replace_gyp_files.py
@@ -17,18 +17,23 @@ import sys
 REPLACEMENTS = {
   'use_system_bzip2': 'third_party/bzip2/bzip2.gyp',
   'use_system_expat': 'third_party/expat/expat.gyp',
+  'use_system_flac': 'third_party/flac/flac.gyp',
   'use_system_harfbuzz': 'third_party/harfbuzz-ng/harfbuzz.gyp',
+  'use_system_icu': 'third_party/icu/icu.gyp',
   'use_system_jsoncpp': 'third_party/jsoncpp/jsoncpp.gyp',
   'use_system_libevent': 'third_party/libevent/libevent.gyp',
   'use_system_libjpeg': 'third_party/libjpeg/libjpeg.gyp',
   'use_system_libpng': 'third_party/libpng/libpng.gyp',
   'use_system_libusb': 'third_party/libusb/libusb.gyp',
+  'use_system_libvpx': 'third_party/libvpx/libvpx.gyp',
   'use_system_libwebp': 'third_party/libwebp/libwebp.gyp',
   'use_system_libxml': 'third_party/libxml/libxml.gyp',
   'use_system_libxslt': 'third_party/libxslt/libxslt.gyp',
   'use_system_opus': 'third_party/opus/opus.gyp',
   'use_system_re2': 'third_party/re2/re2.gyp',
+  'use_system_speex': 'third_party/speex/speex.gyp',
   'use_system_sqlite': 'third_party/sqlite/sqlite.gyp',
+  'use_system_v8': 'v8/tools/gyp/v8.gyp',
   'use_system_zlib': 'third_party/zlib/zlib.gyp',
 }