cc/gcc: always build core pass-1

Up until now, all conditions requiring a core pass-1 was when the
threading implementation used was NPTL. So we only built the core
pass-1 when NPTL was used.

Now, things have changed (what? when? Dunno...), and some bare-metal
canadian toolchains fail to build if a core pass-1 is not present.

OTOH, a core pass-1, although not needed for non-NPTL builds, does
no harm at all if it is present.

So, unconditionally build a core pass-1 (but still pass conditional
options to the core backend).

Reported-by: Per Arnold Blaasmo <Per-Arnold.Blaasmo@atmel.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

 # Compute AVR32-specific values

 CT_DoArchTupleValues() {

     # The architecture part of the tuple:

     CT_TARGET_ARCH="${CT_ARCH}"

     # gcc ./configure flags

     CT_ARCH_WITH_ARCH=

     CT_ARCH_WITH_ABI=

     CT_ARCH_WITH_CPU=

     CT_ARCH_WITH_TUNE=

     CT_ARCH_WITH_FPU=

     CT_ARCH_WITH_FLOAT=

     CT_TARGET_SYS=none

 }