Enable LTO iOS

[louwers]

Not sure if it makes a huge difference in terms of performance.

Encoding time,LTO,Render Time
0.52,No LTO,3.48
0.61,No LTO,3.44
1.94,No LTO,3.49
0.65,No LTO,3.5
0.51,No LTO,3.42
0.62,LTO,3.43
0.79,LTO,3.43
0.98,LTO,3.57
1.07,LTO,3.63
0.53,LTO,3.21
0.53,LTO,3.2
0.52,LTO,3.18
0.51,LTO,3.2
1.01,LTO,3.62
0.81,LTO,3.58
0.67,No LTO,3.5
1.03,LTO,3.63
0.81,No LTO,3.58

[github-actions]

Bloaty Results (iOS) 🐋

Compared to main

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  [ = ]       0  [ = ]       0    TOTAL

Full report: https://maplibre-native.s3.eu-central-1.amazonaws.com/bloaty-results-ios/pr-2504-compared-to-main.txt