[bug#53418] [PATCH] gnu: piper: Fix build.

[John Kehayias]

Hello,

This is a followup to https://issues.guix.gnu.org/53372  fixing Piper (which 
uses libratbag). Python was added to the inputs to fix the build since Meson 
does not propagate Python (added to inputs rather than native-inputs as guix gc 
shows a reference to Python).

That allows Piper to build but it had a librsvg error on startup, like 
syncthing-gtk in https://issues.guix.gnu.org/52651  Fixed the same way here by 
removing librsvg from inputs since it is propagated by gtk+.

(Also simplified the input labels while I was at it, but my quick attempt at 
rewriting the phases with gexps didn't get far. Since I didn't find any similar 
examples in current packages, I left it as is for now.)

Thanks!
John

0001-gnu-piper-Fix-build.patch
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