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Add a SKIA_SHARED flag to the Makefile to build skia as a shared object.

- Add a libskia.so target that uses gcc -shared rather than ar to link.
- Adjust binaries so they use whichever skia library we've configured.



git-svn-id: http://skia.googlecode.com/svn/trunk@1194 2bbb7eff-a529-9590-31e7-b0007b416f81