built output.
This is also a step towards better checks for things like
__attribute__ or std::tr1.
* m4/ax_prefix_config_h.m4: New file.
* configure.ac: Call AC_CONFIG_HEADERS and AX_PREFIX_CONFIG_H.
* src/misc/Makefile.am: Install misc/_config.h.
* src/misc/random.cc, src/misc/version.cc: Include misc/_config.h.
Don't keep it under version control since it is installed by
autoreconf.
* configure.ac: Call LT_CONFIG_LTDL_DIR and LTDL_INIT.
* README: Mention ltdl/.
* Makefile.am: Recurse into ldtl.
* iface/dve2/Makefile.am: Link with it.