SCons: Fix OPUS_ARM_OPT flag applied for all android/iphone arches
SCons: Fix OPUS_ARM_OPT flag applied for all android/iphone arches

The first 'if' always evaluated to true, as it evaluated values which are the default
ones for Android and iOS respectively, so even if one of them was overridden, the other
one would be true.

Fixes #27658.

BastiaanOlij/godot,guilhermefelipecgs/godot,groud/godot,ZuBsPaCe/godot,BastiaanOlij/godot,ZuBsPaCe/godot,pkowal1982/godot,Zylann/godot,MarianoGnu/godot,Paulloz/godot,akien-mga/godot,josempans/godot,DmitriySalnikov/godot,honix/godot,sanikoyes/godot,groud/godot,firefly2442/godot,MarianoGnu/godot,Faless/godot,ZuBsPaCe/godot,okamstudio/godot,BastiaanOlij/godot,Shockblast/godot,godotengine/godot,vnen/godot,firefly2442/godot,Zylann/godot,Valentactive/godot,DmitriySalnikov/godot,okamstudio/godot,ex/godot,okamstudio/godot,pkowal1982/godot,josempans/godot,MarianoGnu/godot,BastiaanOlij/godot,MarianoGnu/godot,Shockblast/godot,pkowal1982/godot,DmitriySalnikov/godot,Paulloz/godot,akien-mga/godot,sanikoyes/godot,okamstudio/godot,ZuBsPaCe/godot,honix/godot,godotengine/godot,godotengine/godot,godotengine/godot,sanikoyes/godot,akien-mga/godot,Valentactive/godot,honix/godot,pkowal1982/godot,vnen/godot,BastiaanOlij/godot,pkowal1982/godot,guilhermefelipecgs/godot,MarianoGnu/godot,Shockblast/godot,godotengine/godot,Valentactive/godot,firefly2442/godot,vnen/godot,Paulloz/godot,DmitriySalnikov/godot,Faless/godot,Shockblast/godot,josempans/godot,DmitriySalnikov/godot,okamstudio/godot,groud/godot,pkowal1982/godot,sanikoyes/godot,sanikoyes/godot,okamstudio/godot,guilhermefelipecgs/godot,guilhermefelipecgs/godot,DmitriySalnikov/godot,vkbsb/godot,Zylann/godot,akien-mga/godot,vnen/godot,DmitriySalnikov/godot,vnen/godot,ZuBsPaCe/godot,Paulloz/godot,okamstudio/godot,akien-mga/godot,vkbsb/godot,Shockblast/godot,Zylann/godot,MarianoGnu/godot,Zylann/godot,firefly2442/godot,BastiaanOlij/godot,vkbsb/godot,akien-mga/godot,ZuBsPaCe/godot,akien-mga/godot,ex/godot,vnen/godot,Faless/godot,honix/godot,sanikoyes/godot,MarianoGnu/godot,vnen/godot,vnen/godot,Faless/godot,sanikoyes/godot,Valentactive/godot,BastiaanOlij/godot,Paulloz/godot,firefly2442/godot,BastiaanOlij/godot,godotengine/godot,vkbsb/godot,ex/godot,firefly2442/godot,guilhermefelipecgs/godot,sanikoyes/godot,okamstudio/godot,honix/godot,vkbsb/godot,Valentactive/godot,josempans/godot,godotengine/godot,Valentactive/godot,ex/godot,ZuBsPaCe/godot,Zylann/godot,akien-mga/godot,firefly2442/godot,groud/godot,vkbsb/godot,josempans/godot,josempans/godot,Shockblast/godot,groud/godot,Zylann/godot,Faless/godot,Valentactive/godot,ex/godot,pkowal1982/godot,ex/godot,Paulloz/godot,godotengine/godot,pkowal1982/godot,okamstudio/godot,guilhermefelipecgs/godot,josempans/godot,vkbsb/godot,Faless/godot,Zylann/godot,Faless/godot,Faless/godot,groud/godot,ex/godot,firefly2442/godot,Shockblast/godot,guilhermefelipecgs/godot,guilhermefelipecgs/godot,ZuBsPaCe/godot,josempans/godot,vkbsb/godot,MarianoGnu/godot,honix/godot,Valentactive/godot,okamstudio/godot,Shockblast/godot,Paulloz/godot,ex/godot