this small package demonstrates how to create ET_DYN ELF
files that are still executable. the only thing that one
should have to change in a normal Makefile is the linker
switches: add "-shared crt1.o interp.o" before the other
object files. after this the resulting binary will look
like a shared library (with full relocs, handled by the
runtime linker) and can be arbitrarily remapped.

interp.o should be compiled only once and put into the
same directory where the other systemwide crt* files are
(since it will be needed for all relinked executables).