Remove extra lapack dependency on Windows

[Will May]

Should only use the subset of lapack that gets installed with R on Windows, instead of including extra lapack source code (R CMD check complains about it). Should check wnominate to see which lapack functions it uses, maybe I can use the same approach.

Edit: In oc, they replace LSVRR from IMSL with DGESDD from lapack. (I replaced it with SGESVD here.) Seems like the solution is to use the double precision as opposed to real version of the functions. wnominate uses eispack instead of lapack, which I don't want to copy.

• SGESVD -> DGESDD
• SSYEV -> DSYEV