Bazel: load rules_cc explicitly

Turns out in #21371 I was right
about `java_*` rules not relying on autoload anywhere, but it turns out
some `cc_*` rules still relied on autoload. This autoload is currently
configured in the internal repository, but we want to remove it
eventually. This patch:
* adds explicit loads to `rules_cc`
* removes an obsolete file (that depedency has its own bazel module
  since some time, we just forgot to remove the old file)

Author: redsun82

swift/third_party/BUILD.binlog.bazel

@@ -1,3 +1,5 @@
+load("@rules_cc//cc:defs.bzl", "cc_binary", "cc_library")
+
 cc_library(
     name = "binlog",
     srcs = glob(["include/**/*.cpp"]),

swift/third_party/BUILD.fmt.bazel

@@ -1,3 +1,5 @@
+load("@rules_cc//cc:defs.bzl", "cc_library")
+
 cc_library(
     name = "picosha2",
     hdrs = glob(["*.h"]),

swift/third_party/BUILD.picosha2.bazel

@@ -1,3 +1,5 @@
+load("@rules_cc//cc:defs.bzl", "cc_library")
+
 cc_library(
     name = "swift-llvm-support-static",
     srcs = glob(