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autoconf: Re-direct error messages if pkg-config cannot be found

Else it will print something like

./configure: line 4426: --exists: command not found

which isn't really helpful, either.

--- a/configure.ac

+++ b/configure.ac

@@ -121,7 +121,7 @@

 AC_ARG_WITH([bashcompletiondir],

     AS_HELP_STRING([--with-bashcompletiondir=DIR], [Bash completion directory]),

     [],

-    [AS_IF([$($PKG_CONFIG --exists bash-completion)],

+    [AS_IF([$($PKG_CONFIG --exists bash-completion 2> /dev/null)],

         [bashcompletiondir=$($PKG_CONFIG --variable=completionsdir bash-completion)],

 	[bashcompletiondir=${datadir}/bash-completion/completions])])