Fix for ABSL CMake build.

Author: haberman

CMakeLists.txt

@@ -168,7 +168,6 @@ add_library(libbloaty
     third_party/abseil-cpp/absl/strings/escaping.cc
     third_party/abseil-cpp/absl/strings/internal/charconv_bigint.cc
     third_party/abseil-cpp/absl/strings/internal/charconv_parse.cc
-    third_party/abseil-cpp/absl/strings/internal/escaping.cc
     third_party/abseil-cpp/absl/strings/internal/memutil.cc
     third_party/abseil-cpp/absl/strings/internal/utf8.cc
     third_party/abseil-cpp/absl/strings/match.cc