Log Message:
Changes 1.5.18:
* Fix regression in 1.5.16 to not install libtldl data files from
  `libtoolize --ltdl'ed software packages.
* Bug Fixes.

Changes 1.5.16:
* Allow shell special characters like `$' in source file names, but not
  in object names, to enhance GCJ support.
* Detection of compiler wrappers like distcc/ccache and $host_alias prefix.
* More robust tests for PIC flag, `-c -o', in presence of warnings.
* Bug Fixes, among others for convenience archives regression on Solaris
  and timestamp-preserving `libtoolize --copy --ltdl'.