base-files patch

[Eric Blake]

Considering the recent thread on rxvt and PS1, I propose the following patches to /etc/default/etc/profile.  In addition to fixing the default PS1 for bash to correctly delineate non-printing characters, it fixes the following additional bugs:  When using case, you do not need to quote a command substitution; this is particularly important since "`""`" is non-portable, just use case `""` instead.  Sorting is not necessarily strictly alphanumeric in other locales (not that cygwin has good locale support, but still...).  Also, `info coreutils dircolors' recently changed to recommend eval "`dircolors ...`", due to the security hole mentioned in http://lists.gnu.org/archive/html/bug-coreutils/2004-12/msg00058.html.

--
Eric Blake
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