Honor the DESTDIR variable to install out-of-place (Eg. for packaging).

/trunk/configure | 10 10 0 0 +++++++++
/trunk/Makefile.in | 62 36 26 0 +++++++++++++++++++++++++++++++-----------------------
/trunk/docs/overview.txt | 12 12 0 0 ++++++++++
3 files changed, 58 insertions(+), 26 deletions(-)

 # x86_64 specific options

 config ARCH_x86_64

     select ARCH_64

     select ARCH_SUPPORT_ARCH

     select ARCH_SUPPORT_CPU

     select ARCH_SUPPORT_TUNE

     help

       The x86_64 architecture, as defined by:

         http://www.amd.com/us-en/Processors/DevelopWithAMD/0,,30_2252_875_7044,00.html