bashcompletiondir should not be set or tested when --disable-bash-completion is given

[Rolf Eike Beer <eb@emlix.com>]

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I tried building some util-linux libraries in a minimal chroot (no pkg-config). 
At the end it boils down to

./configure --disable-bash-completion <other stuff>

The result of this was:

checking for ECONF... no
./configure: line 37542: --exists: command not found
checking for a Python interpreter with version >= 2... none
[...]

        Bash completions:          ${datarootdir}/bash-completion/completions
        Systemd support:           no
[...]
 /bin/mkdir -p '/tmp/e2/root/opt/emlix/master/sbin'
 /bin/mkdir -p '/tmp/e2/root/opt/emlix/master/share/bash-completion/
completions'
 /bin/mkdir -p '/tmp/e2/root/opt/emlix/master/share/man/man1'

The problem with the "--exists" is this line (of course at a totally different 
line number in configure):

  if `$PKG_CONFIG --exists bash-completion`; then :

The PKG_CONFIG variable is empty and in contrast to most other places, the 
other notable exceptions being the checks for tinfow, tinfo, and 
libcryptsetup, the variable is not checked for being empty before usage. And 
at the end this should probably somehow depend on enable_bash_completion=yes 
to avoid creating an empty directory as well.

Regards,

Eike
-- 
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Rolf Eike Beer, emlix GmbH, https://www.emlix.com
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