Introduce four new ARCH specific variables that CT_DoArchValues can set if they want:
- CT_ARCH_CC_CORE_EXTRA_CONFIG
- CT_ARCH_CC_EXTRA_CONFIG
- CT_ARCH_TARGET_CLFAGS
- CT_ARCH_TARGET_LDFLAGS
This will hopefully enable architectures to specify specific flags.
PowerPC will need them to introduce SPE (coming RSN).

/trunk/scripts/crosstool.sh | 2 2 0 0 ++
/trunk/scripts/functions | 4 2 2 0 ++--
/trunk/docs/overview.txt | 45 22 23 0 ++++++++++++++++++++++-----------------------
/trunk/config/target.in | 10 10 0 0 ++++++++++
4 files changed, 36 insertions(+), 25 deletions(-)

# ARM specific configuration file

config ARCH_arm

    select ARCH_SUPPORTS_BOTH_ENDIAN

    select ARCH_DEFAULT_LE

    select ARCH_SUPPORT_ARCH

    select ARCH_SUPPORT_ABI

    select ARCH_SUPPORT_CPU

    select ARCH_SUPPORT_TUNE

    select ARCH_SUPPORT_FPU

    help

      The ARM architecture, as defined by:

        http://www.arm.com/

config ARCH_ARM_EABI

    bool

    prompt "Use EABI (EXPERIMENTAL)"

    depends on EXPERIMENTAL

    default n

    help

      Set up the toolchain so that it generates EABI-compliant binaries.

config ARCH_ABI

    default "aapcs" if ARCH_ARM_EABI