Make ripunzip installer accessible from outside this repo.

* The relative path to misc doesn't work when running from another repo
* The buildifier dependency is not available from other repos,
  therefore we can't pull in //misc/bazel without further refactoring.

Therefore, inline the runfiles snippet here.

misc/ripunzip/BUILD.bazel

@@ -9,5 +9,5 @@ sh_binary(
     srcs = ["install.sh"],
     args = ["$(rlocationpath :ripunzip)"],
     data = [":ripunzip"],
-    deps = ["//misc/bazel:sh_runfiles"],
+    deps = ["@bazel_tools//tools/bash/runfiles"],
 )

misc/ripunzip/install.sh

@@ -2,7 +2,16 @@
 
 set -eu
 
-. misc/bazel/runfiles.sh
+# --- begin runfiles.bash initialization v3 ---
+# Copy-pasted from the Bazel Bash runfiles library v3.
+set -uo pipefail; set +e; f=bazel_tools/tools/bash/runfiles/runfiles.bash
+source "${RUNFILES_DIR:-/dev/null}/$f" 2>/dev/null || \
+  source "$(grep -sm1 "^$f " "${RUNFILES_MANIFEST_FILE:-/dev/null}" | cut -f2- -d' ')" 2>/dev/null || \
+  source "$0.runfiles/$f" 2>/dev/null || \
+  source "$(grep -sm1 "^$f " "$0.runfiles_manifest" | cut -f2- -d' ')" 2>/dev/null || \
+  source "$(grep -sm1 "^$f " "$0.exe.runfiles_manifest" | cut -f2- -d' ')" 2>/dev/null || \
+  { echo>&2 "ERROR: cannot find $f"; exit 1; }; f=; set -e
+# --- end runfiles.bash initialization v3 ---
 
 dest="${2:-$HOME/.local/bin}"