Draft: #ifdef out splash screen support for macOS (1.4.x)

Willy (Wen-Wei) Kaorequested to merge
ltlnx/inkscape:activate-fix into 1.4.x

Follow-up to !7620 (merged) and !7045 (merged).

#ifdef out splash screen support for macOS.

Fixes #5740 (closed)

Edited by Willy (Wen-Wei) Kao

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