Add a flag to generate the Makefile in a different directory than...

test/variables/commands/commands.gyp.ignore-env.stdout

 GENERAL: running with these options:
+GENERAL:   check: None
+GENERAL:   circular_check: True
+GENERAL:   debug: ['variables', 'general']
+GENERAL:   defines: None
+GENERAL:   depth: '.'
+GENERAL:   formats: ['gypd']
+GENERAL:   generator_flags: []
+GENERAL:   generator_output: None
+GENERAL:   includes: None
 GENERAL:   msvs_version: None
 GENERAL:   suffix: ''
-GENERAL:   includes: None
+GENERAL:   toplevel_dir: None
 GENERAL:   use_environment: False
-GENERAL:   depth: '.'
-GENERAL:   generator_flags: []
-GENERAL:   generator_output: None
-GENERAL:   formats: ['gypd']
-GENERAL:   debug: ['variables', 'general']
-GENERAL:   circular_check: True
-GENERAL:   check: None
-GENERAL:   defines: None
 GENERAL: cmdline_default_variables: {}
 GENERAL: generator_flags: {}
 VARIABLES: Expanding '0' to 0
 VARIABLES: Expanding '11 ' to '11 '
 VARIABLES: Expanding '+14' to '+14'
 VARIABLES: Expanding '-15' to -15
 VARIABLES: Expanding ' 10' to ' 10'
 VARIABLES: Matches: {'content': 'letters_list', 'is_array': '', 'type': '<', 'replace': '<(letters_list)'}
 VARIABLES: Expanding 'letters_list' to 'letters_list'
 VARIABLES: Found output 'ABCDEFG', recursing.
@@ skipping 220 matching lines @@
 VARIABLES: Expanding 'target' to 'target'
 VARIABLES: Expanding 'none' to 'none'
 VARIABLES: Expanding 'letters_list' to 'letters_list'
 VARIABLES: Expanding 'test_action' to 'test_action'
 VARIABLES: Expanding 'echo' to 'echo'
 VARIABLES: Expanding '"3.14159265359 ABCD"' to '"3.14159265359 ABCD"'
 VARIABLES: Expanding 'ABCD letters_list' to 'ABCD letters_list'
 VARIABLES: Expanding '3.14159265359 ABCD' to '3.14159265359 ABCD'
 VARIABLES: Expanding 'ABCD' to 'ABCD'
 VARIABLES: Expanding 'letters_list' to 'letters_list'