* lib/autoconf/status.m4 (_AC_OUTPUT_FILES_PREPARE): Prefer \r to

* lib/autoconf/status.m4 (_AC_OUTPUT_FILES_PREPARE): Prefer \r to
an actual carriage return.  Use "ac_cr" to contain the actual
carriage return.
* doc/autoconf.texi (Limitations of Usual Tools): Document problem
with traditional Awk and begin.
* tests/torture.at (Limitations of Builtins): Document the problem
with Bash 2.03 printf.
(Substitute and define special characters):
Remove trailing white space.  Work around a bug in Solaris 8 /bin/bash.