intl: Don't compile relocatable.c any more.
The library does not need relocatable.h any more since today.
As a side effect, libintl.la gets installed again and "make uninstall" erases
the installed libintl.{a,so} again (regressions from 2021-06-20).
Reported by David Bohman <debohman@gmail.com> at
<https://savannah.gnu.org/bugs/?64536>.
* autogen.sh (GNULIB_MODULES_LIBINTL): Remove relocatable-lib-lgpl.
* gnulib-local/modules/gettext-runtime-intl-misc (Makefile.am): Don't augment
AM_CPPFLAGS.
* gettext-runtime/intl/configure.ac: Don't set enable_relocatable.
Don't define the C symbols relocate, relocate2.
* gettext-runtime/intl/compat.c: New file.
* gettext-runtime/intl/Makefile.am: Update comments.
(LIBINTLSOURCES): Add compat.c.
(compat.lo): New rule.
