support for LAPACK callback methods

[fommil]

The "select" argument is an external function whose definition looks like this in Fortran:

  LOGICAL          FUNCTION DSLECT( ZR, ZI )
  DOUBLE PRECISION   ZI, ZR

In the Java translation, the code uses reflection to get the first method (under the assumption that it was f2j-generated).

Native support for this could be tricky.