Change ruby syntax: [ foo ].shelljoin → foo.shellescape

bin/gen_build

@@ -644,7 +644,7 @@ def all_targets(buildfile, builddir)
   return res unless File.exists? buildfile
 
   Dir.chdir(File.dirname(buildfile)) do
-    targets = %x{ ${TM_NINJA:-ninja} -f #{[ buildfile ].shelljoin } -t targets all }
+    targets = %x{ ${TM_NINJA:-ninja} -f #{buildfile.shellescape} -t targets all }
     return nil if $? != 0
     targets.each do |line|
       if line =~ /.*(?=:(?! phony))/