Changing include paths used in the public repo.

This CL ensures that `#include`s of `absl` headers use a path similar to
what is used in https://github.com/abseil/abseil-cpp - e.g.: `#include
"absl/strings/ascii.h"`.

Similarily, for LLVM headers, this CL changes their `#include` path to
what is used in https://github.com/llvm/llvm-project - e.g.: `#include
"clang/AST/Decl.h"` or `#include "llvm/Support/ErrorHandling.h"`.

This should help build Crubit in a scenario where its dependencies (i.e.
Abseil and LLVM/Clang) are at different paths than the ones used prior
this CL.

PiperOrigin-RevId: 444899882

rs_bindings_from_cc/decl_importer.h

diff --git a/rs_bindings_from_cc/decl_importer.h b/rs_bindings_from_cc/decl_importer.h
index 687bf35..487f1c7 100644
--- a/rs_bindings_from_cc/decl_importer.h
+++ b/rs_bindings_from_cc/decl_importer.h
@@ -5,8 +5,8 @@
 #ifndef CRUBIT_RS_BINDINGS_FROM_CC_DECL_IMPORTER_H_
 #define CRUBIT_RS_BINDINGS_FROM_CC_DECL_IMPORTER_H_
 
-#include "third_party/absl/container/flat_hash_map.h"
-#include "third_party/absl/status/statusor.h"
+#include "absl/container/flat_hash_map.h"
+#include "absl/status/statusor.h"
 #include "lifetime_annotations/lifetime_annotations.h"
 #include "rs_bindings_from_cc/bazel_types.h"
 #include "rs_bindings_from_cc/ir.h"