Add unittest for 'LD' in 'make_global_settings'

test/make_global_settings/ld/make_global_settings_ld.gyp

Index: test/make_global_settings/ld/make_global_settings_ld.gyp
diff --git a/test/make_global_settings/ar/make_global_settings_ar.gyp b/test/make_global_settings/ld/make_global_settings_ld.gyp
similarity index 60%
copy from test/make_global_settings/ar/make_global_settings_ar.gyp
copy to test/make_global_settings/ld/make_global_settings_ld.gyp
index 3430d82a517aec983ecfefec1595399982f3dfb6..6837c77326153c3afdee418404127c1527af27cf 100644
--- a/test/make_global_settings/ar/make_global_settings_ar.gyp
+++ b/test/make_global_settings/ld/make_global_settings_ld.gyp
@@ -4,24 +4,24 @@
 
 {
   'variables': {
-    'custom_ar_target%': '',
-    'custom_ar_host%': '',
+    'custom_ld_target%': '',
+    'custom_ld_host%': '',
   },
   'conditions': [
-    ['"<(custom_ar_target)"!=""', {
+    ['"<(custom_ld_target)"!=""', {
       'make_global_settings': [
-        ['AR', '<(custom_ar_target)'],
+        ['LD', '<(custom_ld_target)'],
       ],
     }],
-    ['"<(custom_ar_host)"!=""', {
+    ['"<(custom_ld_host)"!=""', {
       'make_global_settings': [
-        ['AR.host', '<(custom_ar_host)'],
+        ['LD.host', '<(custom_ld_host)'],
       ],
     }],
   ],
   'targets': [
     {
-      'target_name': 'make_global_settings_ar_test',
+      'target_name': 'make_global_settings_ld_test',
       'type': 'static_library',
       'sources': [ 'foo.c' ],
     },