Default to shared.

- Removed the unnecessary extra configure option --enable-shared-embed
- Changed --enable-embed to accept parameters shared/static and default
to static build.

Follow Yasuo's suggestion and build sapi program's under the sapi-specific
directory.

Move sapi-specific makefile fragments to their respective directory.

Create an embed sapi m

Follow Yasuo's suggestion and build sapi program's under the sapi-specific
directory.

Move sapi-specific makefile fragments to their respective directory.

Create an embed sapi module which resides in its own dir now.

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