Move //courgette/third_party to subfolder.

courgette/BUILD.gn

Index: courgette/BUILD.gn
diff --git a/courgette/BUILD.gn b/courgette/BUILD.gn
index a5cb6600ddbe0d46f7a2696c396475cabe9f89de..53cce77f4af0c61dc35a9b4857252c69155b10be 100644
--- a/courgette/BUILD.gn
+++ b/courgette/BUILD.gn
@@ -51,11 +51,11 @@ static_library("courgette_lib") {
     "simple_delta.h",
     "streams.cc",
     "streams.h",
-    "third_party/bsdiff.h",
-    "third_party/bsdiff_apply.cc",
-    "third_party/bsdiff_create.cc",
-    "third_party/paged_array.h",
-    "third_party/qsufsort.h",
+    "third_party/bsdiff/bsdiff.h",
+    "third_party/bsdiff/bsdiff_apply.cc",
+    "third_party/bsdiff/bsdiff_create.cc",
+    "third_party/bsdiff/paged_array.h",
+    "third_party/bsdiff/qsufsort.h",
     "types_elf.h",
     "types_win_pe.h",
   ]
@@ -120,8 +120,8 @@ test("courgette_unittests") {
     "memory_allocator_unittest.cc",
     "rel32_finder_win32_x86_unittest.cc",
     "streams_unittest.cc",
-    "third_party/paged_array_unittest.cc",
-    "third_party/qsufsort_unittest.cc",
+    "third_party/bsdiff/paged_array_unittest.cc",
+    "third_party/bsdiff/qsufsort_unittest.cc",
     "typedrva_unittest.cc",
     "versioning_unittest.cc",
   ]