* Makefile.in (*_FOR_TARGET, INSTALL_XFORM, install, uninstall): Rewrite

* Makefile.in (*_FOR_TARGET, INSTALL_XFORM, install, uninstall): Rewrite
handling of program_transform_name.

* configure.in: Test for "unlink" and "delete", define USE_DELETE_FOR_UNLINK if
only the latter is found.  Not expected to be triggered on UNIX/POSIX systems.
* acconfig.h (USE_DELETE_FOR_UNLINK): Undef here, provide comments.

Update for autoconf 1.118:
* gdbinit.in: New file, created from old .gdbinit.
* .gdbinit: Deleted.
* aclocal.m4 (GAS_GDBINIT): Deleted.
* configure.in: Don't use it.  Instead, generate .gdbinit from gdbinit.in.
Don't substitute cpu_type, obj_format, emulation, atof.  Switched order of
AC_LINK_FILES arguments.  Use AC_PREREQ to ensure that older versions of
autoconf aren't used.
* Makefile.in: Added @configure_input@ line.
(configure): Deleted rule.

[regenerated conf.in, configure]