This pull request is continued from this pull request.
Previously I tried to keep the changes minimal but I later realized that it wasn't sufficient to truly satisfy cross compatibility issues.
This second attempt is admittedly much bigger due to leveraging libtool (e.g. the auxiliary files) but in return, this project is now cross platform friendly.
Use autotools for building the CLD source.
Install within the project directory.
Run configure only when necessary.
Include aclocal.m4 for autoconf.
Merge pull request #7 from tmaesaka/use-autotools
Use autotools for cross platform friendliness