gcc-package-sdk.inc: ${layout_base_bindir} is not the path to where the real binary is.

gcc-package-sdk.inc: ${layout_base_bindir} is not the path to where the real binary is.
The binary will always be two levels back, and it will always be in ${bindir}
as that's what we pass to configure, so basename that to find the right
directory name.  Bump INC_PR in gcc-canadian-sdk 4.2.4,
gcc-cross-sdk 4.2.4/4.3.3/4.4.0