Ghostscript disabled features and EPS

[Jean Abou Samra]

I just realized one thing about the Ghostscript trimming that
was extensively discussed on -user some time ago
(https://lists.gnu.org/archive/html/lilypond-user/2022-11/msg00045.html):

The regtest markup-eps.ly does not compile on official 2.24 binaries.

The reason is that it embeds an EPS file that uses the /Helvetica 15 
selectfont
idiom.

Now, \postscript is kind of bad in the first place, but an EPS file
with /Helvetica 15 selectfont is perfectly valid. Thus, shouldn't
we stop trimming Ghostscript in this way?

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