jit: fix location of .png files for "make jit.pdf" [PR102824]

jit: fix location of .png files for "make jit.pdf" [PR102824]

"make jit.pdf" seems to be looking in
  gcc/jit/docs/_build/texinfo/libgccjit-figures
for the .png files, but they were in the source tree in:
  gcc/jit/docs/_build/texinfo

Fix "make jit.pdf" via:
  git mv \
    gcc/jit/docs/_build/texinfo/*.png \
    gcc/jit/docs/_build/texinfo/libgccjit-figures

gcc/jit/ChangeLog:
	PR jit/102824
	* docs/_build/texinfo/factorial.png: Move to...
	* docs/_build/texinfo/libgccjit-figures/factorial.png: ...here.
	* docs/_build/texinfo/factorial1.png: Move to...
	* docs/_build/texinfo/libgccjit-figures/factorial1.png: ...here.
	* docs/_build/texinfo/sum-of-squares.png: Move to...
	* docs/_build/texinfo/libgccjit-figures/sum-of-squares.png: ...here.
	* docs/_build/texinfo/sum-of-squares1.png: Move to...
	* docs/_build/texinfo/libgccjit-figures/sum-of-squares1.png: ...here.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>