configure.ac: more quoting
authorJim Meyering <jim@meyering.net>
Thu, 30 Jul 2009 12:03:48 +0000 (14:03 +0200)
committerRichard Jones <rjones@redhat.com>
Thu, 30 Jul 2009 12:44:35 +0000 (13:44 +0100)
Also, prohibit an invalid value of $JAVA_HOME,
since it must be used unquoted below.


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