disable "thin" static libraries by default

Older linkers don't have the -T flag.

This is a somewhat experimental feature, so if user's want "thin"
archives, they can specify `--thin` to revert to the original behavior.

addon.gypi

@@ -12,7 +12,12 @@
       ['_type=="loadable_module"', {
         'product_extension': 'node',
         'defines': [ 'BUILDING_NODE_EXTENSION' ],
-      }]
+      }],
+      ['_type=="static_library"', {
+        # set to `1` to *disable* the -T thin archive 'ld' flag.
+        # older linkers don't support this flag.
+        'standalone_static_library': '<(standalone_static_library)'
+      }],
     ],
 
     'conditions': [

lib/configure.js

@@ -287,6 +287,9 @@ function configure (gyp, argv, callback) {
     // don't copy dev libraries with nodedir option
     variables.copy_dev_lib = !gyp.opts.nodedir
 
+    // disable -T "thin" static archives by default
+    variables.standalone_static_library = gyp.opts.thin ? 0 : 1;
+
     // loop through the rest of the opts and add the unknown ones as variables.
     // this allows for module-specific configure flags like:
     //

lib/node-gyp.js

@@ -86,6 +86,7 @@ proto.configDefs = {
   , python: String    // 'configure'
   , 'dist-url': String // 'install'
   , jobs: String      // 'build'
+  , thin: String      // 'configure'
 }
 
 /**