* ltmain.in (libobj): default value must not contain directory

	* ltmain.in (libobj): default value must not contain directory
 	components

	* ltconfig.in (compiler): detect if the compiler supports
	-c and -o flags, create a variable compiler_c_o. Also issue
	a big warning if it is not supported

	* ltmain.in (compile): enable the -o option as input for libtool.
	The objects are not moved if the compiler supports -o with -c.
	Sources and objects can contain relative directories.
	(link): enable the linking of executables into relative directories