Log Message:
Fix broken Solaris build by not using sys_errlist.

Clean up other problems revealed by gcc -Wall:
   - pass (char *)NULL, not 0, as the last arg of execlp, to avoid
     crashes on LP64 platforms;
   - use signal.h, not sys/signal.h;
   - use utime(3) correctly;
   - use W* macros and sys/wait.h instead of hardcoding bit patterns.

Note in the DESCR that the package has been patched, as the license
might be construed to require this.

PKGREVISION -> 2.