configure.in: add --disable-libuuid option

Add an option to switch between the private (in-tree) libuuid and
public (in-system installed) library.  The private version is still
enabled by default.

Signed-off-by: Scott James Remnant <scott@netsplit.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/configure b/configure
index 4dee536..01dd14f 100755
--- a/configure
+++ b/configure
Binary files differ