[Build, Driver] Add -lcilkrts for -fcilkplus

[Tobias Burnus]

Paolo Bonzini wrote:
> Il 11/03/2014 07:42, Tobias Burnus ha scritto:
>> +XPCFLAGS=""
>> +CFLAGS="$CFLAGS -pthread"
>> +AC_LINK_IFELSE(
>> ...
>> + [XPCFLAGS=" -Wc,-pthread"],
> XPCFLAGS is dead, I think?

Yes - contrary to libgomp, from which I have taken that code block. I 
have now removed it.

> Also, should -pthread be included in the spec too?

Regarding -pthreads: That should already be included via gcc/gcc.c:

+#define CILK_SELF_SPECS "%{fcilkplus: -pthread}"

  static const char *const driver_self_specs[] = {
...
CILK_SELF_SPECS
  };

Updated patch below (nongenerated libcilkrts only).

Tobias

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