Fix cctest + unittest to work with an external snapshot.

test/cctest/cctest.gyp

Index: test/cctest/cctest.gyp
diff --git a/test/cctest/cctest.gyp b/test/cctest/cctest.gyp
index bafd319c92267c2033e96a2cde178408e5d180a7..4a6dea7dfab492f7909dbf84f5e224d8bdcd8ef4 100644
--- a/test/cctest/cctest.gyp
+++ b/test/cctest/cctest.gyp
@@ -167,7 +167,9 @@
         'test-weakmaps.cc',
         'test-weaksets.cc',
         'test-weaktypedarrays.cc',
-        'trace-extension.cc'
+        'trace-extension.cc',
+        '../../src/startup-data-util.h',
+        '../../src/startup-data-util.cc'

[vogelheim, 2015/02/10 15:03:33]

This is a bit ugly... Is there a good place where to put definitions that are
meant to go only into d8 + cctest + unittest?

[jochen (gone - plz use gerrit), 2015/02/10 15:05:56]

I think it's ok.

An alternative was to add those magically to all targets that produce binaries,
but I think that's actually worse.

       ],
       'conditions': [
         ['v8_target_arch=="ia32"', {