SCons: Fix missing mono `.gen.cpp` sources after #53860
SCons: Fix missing mono `.gen.cpp` sources after #53860

guilhermefelipecgs/godot,godotengine/godot,firefly2442/godot,BastiaanOlij/godot,pkowal1982/godot,Faless/godot,godotengine/godot,godotengine/godot,vnen/godot,akien-mga/godot,firefly2442/godot,sanikoyes/godot,guilhermefelipecgs/godot,sanikoyes/godot,ZuBsPaCe/godot,josempans/godot,Faless/godot,vnen/godot,Valentactive/godot,Faless/godot,vnen/godot,Valentactive/godot,ZuBsPaCe/godot,Faless/godot,vnen/godot,Valentactive/godot,akien-mga/godot,Faless/godot,godotengine/godot,vkbsb/godot,vkbsb/godot,firefly2442/godot,vkbsb/godot,akien-mga/godot,pkowal1982/godot,Valentactive/godot,josempans/godot,akien-mga/godot,firefly2442/godot,Shockblast/godot,josempans/godot,Valentactive/godot,vnen/godot,BastiaanOlij/godot,Zylann/godot,BastiaanOlij/godot,guilhermefelipecgs/godot,Faless/godot,vnen/godot,sanikoyes/godot,BastiaanOlij/godot,josempans/godot,akien-mga/godot,Zylann/godot,sanikoyes/godot,vkbsb/godot,vnen/godot,firefly2442/godot,akien-mga/godot,ZuBsPaCe/godot,Shockblast/godot,Valentactive/godot,ZuBsPaCe/godot,godotengine/godot,guilhermefelipecgs/godot,vkbsb/godot,sanikoyes/godot,Faless/godot,Zylann/godot,sanikoyes/godot,Shockblast/godot,Shockblast/godot,Valentactive/godot,vkbsb/godot,vnen/godot,guilhermefelipecgs/godot,pkowal1982/godot,Zylann/godot,Faless/godot,ZuBsPaCe/godot,Shockblast/godot,godotengine/godot,Shockblast/godot,BastiaanOlij/godot,akien-mga/godot,ZuBsPaCe/godot,Zylann/godot,josempans/godot,godotengine/godot,sanikoyes/godot,pkowal1982/godot,ZuBsPaCe/godot,pkowal1982/godot,Shockblast/godot,ZuBsPaCe/godot,akien-mga/godot,Zylann/godot,guilhermefelipecgs/godot,vkbsb/godot,Zylann/godot,firefly2442/godot,josempans/godot,BastiaanOlij/godot,Valentactive/godot,BastiaanOlij/godot,guilhermefelipecgs/godot,Zylann/godot,josempans/godot,pkowal1982/godot,josempans/godot,sanikoyes/godot,firefly2442/godot,BastiaanOlij/godot,guilhermefelipecgs/godot,firefly2442/godot,pkowal1982/godot,pkowal1982/godot,Shockblast/godot,godotengine/godot,vkbsb/godot