configure: Make autoconf fail if libtool is not installed.
authorBen Pfaff <blp@nicira.com>
Tue, 31 Dec 2013 22:20:01 +0000 (14:20 -0800)
committerBen Pfaff <blp@nicira.com>
Fri, 10 Jan 2014 18:50:53 +0000 (10:50 -0800)
Otherwise users get an error later like:
    ./configure: line 5093: syntax error near unexpected token
    `disable-shared' ./configure: line 5093: `LT_INIT(disable-shared)'
It's probably friendlier to make configuration fail earlier.

Signed-off-by: Ben Pfaff <blp@nicira.com>

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