octave-launch: Set number of OpenBLAS threads to number of cores (bug #61208). * installer-files/octave-launch.c (get_num_physical_cores): New function to get number of physical processor cores. (wmain): Set OPENBLAS_NUM_THREADS to number of physical processor cores for performance.

*
* This file is part of MXE.
* See index.html for further information.
*
      INTEGER MAJOR, MINOR, PATCH
*
      CALL ILAVER ( MAJOR,MINOR, PATCH )
      WRITE(*,*) "LAPACK ",MAJOR,".",MINOR,".",PATCH
*
      END