Fix subsidiary build tests

build_tests/subsidiary/Rsconscript

@@ -5,6 +5,6 @@ configure do
 end
 
 default do
-  rscons "sub/Rsconscript2", "build"
+  rscons "sub/Rsconscript2"
   puts "top build"
 end

build_tests/subsidiary/Rsconscript_dir

@@ -5,6 +5,6 @@ configure do
 end
 
 default do
-  rscons "sub", "-f", "Rsconscript2", "build"
+  rscons "sub", "-f", "Rsconscript2"
   puts "top build"
 end

build_tests/subsidiary/Rsconscript_fail

@@ -4,6 +4,6 @@ configure do
 end
 
 default do
-  rscons "sub/Rsconscript2", "build"
+  rscons "sub/Rsconscript2"
   puts "top build"
 end

build_tests/subsidiary/Rsconscript_samedir

@@ -1,4 +1,4 @@
 default do
-  rscons "second", "build"
+  rscons "second", "default"
   puts "top build"
 end