Picture filenames with multiple dots, workaround not working with texlive 2019

[25 C]

Hello,

this is not a lyx bug however affects a workaround that has been put in
place in lyx to deal with filenames with multiple dots. After updating to
texlive 2019 I discovered that the workaround for files with multiple dots
does not work anymore.

If you export a .lyx file to .tex and pass it to pdflatex, expressions like:
\includegraphics{dummy\lyxdot 1\lyxdot 0}
give an error:
LaTeX Warning: File `dummy.1.0' not found on input line 19.
! LaTeX Error: Unknown graphics extension: .1.0.
while on texlive 2018 everything worked.

Thanks for having a look.
Best regards,
Pietro
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