Make flattenables no longer depend on global static initializers.

Make flattenables no longer depend on global static initializers.

Instead, force all builds to call InitializeFlattenables.

Remove the make_debugger script, which was created to force
rebuilding without global static initializers so that all flattenables
would be linked. It is no longer necessary since all flattenables
will be linked thanks to InitializeFlattenables, which now can (and
must) be called when global static initializers are turned on.

BUG=https://code.google.com/p/skia/issues/detail?id=903
BUG=https://code.google.com/p/skia/issues/detail?id=902

Review URL: https://codereview.appspot.com/6548044

git-svn-id: http://skia.googlecode.com/svn/trunk@5642 2bbb7eff-a529-9590-31e7-b0007b416f81