h8300 archtecure support update

includes

H8S architecture support
signal handling problem fix
interrupt management update
target-support file update
gcc-3.3 support
config script fix
used common header files
vfork/clone return value fix
sys_settimeofday error fix
added show_stack
defconfig update
build error and warning fix

patch file is http://uclinux-h8.sourceforge.jp/linux-2.6.0-test1-h8300.diff.gz

Yoshinori Sato
<[email protected]>