+ Monosynth: fix type bug that made it impossible to compile with g++ 4.2

(cherry picked from commit f2cd6987deba9f82a9824529bad6de2ab89e0bc6)
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f