complibs/cloog: with static ppl, correctly link with libm

On some Fedora boxen (at least FC13), it is also required
to link with libm when static ppl is used.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
(transplanted from 5526fb72a893f89286d6daa29da0161ca988a1d0)

 # m68k specific configuration file

 # depends on EXPERIMENTAL

 config ARCH_m68k

     select ARCH_SUPPORTS_32

     select ARCH_DEFAULT_32

     select ARCH_DEFAULT_BE

     select ARCH_SUPPORT_CPU

      help

       The m68k architecture