[bundler/bundler] Require relatively from exe/ when possible

https://github.com/bundler/bundler/commit/e4cbb91b7d

libexec/bundle

@@ -7,7 +7,14 @@ Signal.trap("INT") do
   exit 1
 end
 
-require "bundler"
+base_path = File.expand_path("../lib", __dir__)
+
+if File.exist?(base_path)
+  require_relative "../lib/bundler"
+else
+  require "bundler"
+end
+
 # Check if an older version of bundler is installed
 $LOAD_PATH.each do |path|
   next unless path =~ %r{/bundler-0\.(\d+)} && $1.to_i < 9
@@ -18,9 +25,18 @@ $LOAD_PATH.each do |path|
   abort(err)
 end
 
-require "bundler/friendly_errors"
+if File.exist?(base_path)
+  require_relative "../lib/bundler/friendly_errors"
+else
+  require "bundler/friendly_errors"
+end
+
 Bundler.with_friendly_errors do
-  require "bundler/cli"
+  if File.exist?(base_path)
+    require_relative "../lib/bundler/cli"
+  else
+    require "bundler/cli"
+  end
 
   # Allow any command to use --help flag to show help for that command
   help_flags = %w[--help -h]