placing .o files correctly

From now on, directories are also possible as arguments.

In some cases the gcc produces syntactially different object files,
which are semantically equivalent. For example, gcc uses an internal 'I
have seen a name'-counter to name function local variables which are
placed within a data-section.

The gcc compiler adds a FILE symbol to the object file. In order to make
more object hashes equal, we strip exactly that symbol from the .symtab.

Wombat