fetch-bundled_gems.rb: Fix extraneous newline

Print a concatenated string instead of `print`ing multiple strings,
since `$\` is set to `"\n"` because of `-l` command line option.

Author: nobu

tool/fetch-bundled_gems.rb

@@ -40,9 +40,8 @@
 end
 
 checkout = %w"git -c advice.detachedHead=false checkout"
-print %[checking out #{color.notice(c)} (v=#{color.info(v)}]
-print %[, r=#{color.info(r)}] if r
-puts ") ..."
+info = %[, r=#{color.info(r)}] if r
+puts "checking out #{color.notice(c)} (v=#{color.info(v)}#{info}) ..."
 unless system(*checkout, c, "--", chdir: n)
   abort if r or !system(*checkout, v, "--", chdir: n)
 end