Removes dartc reliance on its own libraries, now can be targeted at any implementation's libraries

dart.gyp

Index: dart.gyp
diff --git a/dart.gyp b/dart.gyp
index 844514bc5583edca4afe561cb6ab65fb3e27789a..5dd6e117a15be6a23ddc285a465a66e7ce5e6e60 100644
--- a/dart.gyp
+++ b/dart.gyp
@@ -13,7 +13,7 @@
       'target_name': 'compiler',
       'type': 'none',
       'dependencies': [
-        'compiler/dart-compiler.gyp:dartc',
+        'compiler/dart-compiler.gyp:darta',
       ],
       'actions': []
     },
@@ -50,6 +50,7 @@
       ],
       'dependencies': [
         'runtime',
+        'compiler'
       ],
       'actions': [
         {