Revert "Comment out HAVE_Z64 if not defined - still Glide64+HLE RSP is a lot"

This reverts commit 722044d6ed18304bde9f5ab5682f81c13ecd8b53.
Revert "Fix z64 RSP"

This reverts commit 8c062592ce62c5b98fa73bfc8b31fdbf3353299f.
Revert "(z64 RSP) Add back rsp.ext"

This reverts commit 9bf58497d01f66a0d00eb083578699a1a825e2fe.
Revert "Start adding z64 RSP - not working yet - name symbol conflicts"

This reverts commit 0db14f2681e7b383b7ac00b6cde26f9c1320a498.
Revert "(mupen64plus-rsp-z64) Add rsp-z64 - will still need to integrate it"

This reverts commit 06e0b42ea140eebd1876de3b91e24494809976ef.