[bug#43249] Resolve Calibre run-time dependency

[Prafulla Giri]

Esteemed maintainers,

Currently, Calibre can't open .epub files unless `qtwebengine` package is also available in one's $GUIX_PROFILE. Neither can the stand-alone `ebook-viewer` program supplied with Calibre. It exits with the complaint: "Could not find QtWebEngineProcess".

Attached is a patch to fix the issue. QtWebEngineProcess is now made available to all Calibre binaries via QTWEBENGINE_PATH set during a new 'wrap-program phase introduced with the patch.

Thank you

0001-gnu-calibre-make-QtWebEngineProcess-available-during.patch
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