Greatly simplify build system by removing libtool and integrating formerly

Greatly simplify build system by removing libtool and integrating formerly
dynamically loaded modules into the now-static libyasm.  I now anticipate
that there would be very few users of the dynamic loading features, and it
yielded a lot of instability and build headaches for very little benefit.
The new build should now be much more cross-platform and faster (there was
a lot of overhead in finding and loading modules).

 * libtool.m4, ltdl.m4: Delete.
 * m4/Makefile.am: Rename to m4/Makefile.inc and remove references to above.
   Change to use subdirectory (flat) build rather than recursive build.
 * Makefile.am: Include m4/Makefile.inc rather than having it in SUBDIRS.
 * libltdl: Delete.

 * frontends/yasm/yasm-module.c: Delete.
 * basename.c, dirname.c: Delete (no longer needed by yasm-module.c).
 * genmodule.c, module.in: Generator and template for new module.c included
   in libyasm that replaces the old yasm-module.c (module.in is a modified
   rename of yasm-module.c).
 * module.h: Modified rename of old yasm-module.h.
 * libyasm.h: Include libyasm/module.h.
 * libyasm/Makefile.inc: Build generator and include module.c in libyasm.
 * yasm.c: Use new libyasm module interface.

 * (many) Makefile.inc: Remove libtool libraries, build all modules into
   libyasm library.

 * configure.ac: Remove libtool/libltdl references.

 * Mkfiles/vc/yasm-module.c: Remove.  Still need to fix some of the other
   Mkfiles/ build files for these changes.

svn path=/trunk/yasm/; revision=1183