Simplify the library: Don't compile relocatable.c any more.

The library does not need relocatable.h any more since 2018-09-22.

* lib/relocatable.h: Remove file.
* lib/relocatable.c: Remove file.
* lib/compat.c: New file.
* lib/Makefile.in (DEFS): Don't define LIBDIR, BUILDING_DLL,
ENABLE_RELOCATABLE, IN_LIBRARY, INSTALLDIR, NO_XMALLOC,
set_relocation_prefix, relocate, relocate2.
(SOURCES): Remove relocatable.c. Add compat.c.
(OBJECTS): Remove relocatable.lo. Add compat.lo.
(localcharset.lo): Update dependencies.
(relocatable.lo): Remove rule.
(compat.lo): Add rule.
(SOURCE_FILES): Remove relocatable.h, relocatable.c. Add compat.c.
5 files changed