than "sh" for executing commands. Useful in a cross-build environment.
* Do not define _PATH_BSHELL, because it is no longer used by make.
* In addition to _PATH_DEFSHELLDIR (the directory in which the default
shell can be found), define _BASENAME_DEFSHELL (the shell's basename).
* Use shell builtin string manipulation instead of sed to extract
the directory name and basename from $BSHELL.
OK sjg, christos
71ba9763cb