Remove IMAGINARY macro
Remove IMAGINARY macro

It is sure this compiler is not going to
implement the imaginary extension, so
remove IMAGINARY macro.

8l/scc,8l/scc,k0gaMSX/scc,8l/scc,k0gaMSX/kcc,k0gaMSX/scc,k0gaMSX/scc,k0gaMSX/kcc