d: give dependency files better filenames [PR118477]

d: give dependency files better filenames [PR118477]

Currently, the dependency files for root-file.o and common-file.o were
both d/.deps/file.Po, which would cause parallel builds to fail
sometimes with:

  make[3]: Leaving directory '/var/tmp/portage/sys-devel/gcc-14.1.1_p20240511/work/build/gcc'
  make[3]: Entering directory '/var/tmp/portage/sys-devel/gcc-14.1.1_p20240511/work/build/gcc'
  mv: cannot stat 'd/.deps/file.TPo': No such file or directory
  make[3]: *** [/var/tmp/portage/sys-devel/gcc-14.1.1_p20240511/work/gcc-14-20240511/gcc/d/Make-lang.in:421: d/root-file.o] Error 1 shuffle=131581365

Also, this means that dependencies of one of root-file or common-file
are missing when developing.  After this patch, those two files get
assigned dependency files d/.deps/root-file.Po and
d/.deps/common-file.Po respectively, so match the actual object
files in the d/ subdirectory.

There are other files with similar conflicts (mangle-package.o,
visitor-package.o for instance).

2025-01-29  Arsen Arsenović  <arsen@aarsen.me>
	    Jakub Jelinek  <jakub@redhat.com>

	PR d/118477
	* Make-lang.in (DCOMPILE, DPOSTCOMPILE): Use $(basename $(@F))
	instead of $(*F).

Co-Authored-By: Jakub Jelinek <jakub@redhat.com>