Find{BLAS,LAPACK}: Add support for ArmPL targets

Add support for the Arm Performance Libraries (ArmPL) which provide an
implementation of BLAS, LAPACK and FFTW for use on Arm Linux systems:

    https://developer.arm.com/tools-and-software/server-and-hpc/compile/arm-compiler-for-linux/arm-performance-libraries
2 files changed