Disable -ffast-math for iOS builds #3511

Job	Run time
coverage (ubuntu-20.04)	5m 13s
alpine 3.16.0 (musl)	15m 13s
Ubuntu/Debian packaging (Ubuntu 20.04)	8m 58s
ubuntu-20.04 (package, non-mavsdk_server)	6m 15s
android-arm	5m 17s
ubuntu-22.04 (package, non-mavsdk_server)	7m 16s
linux-armv6	7m 14s
android-arm64	8m 9s
linux-armv6-musl	11m 40s
linux-armv7	7m 23s
android-x86	5m 14s
linux-armv7l-musl	20m 39s
linux-arm64	6m 13s
ios	1m 1s
android-x86_64	9m 20s
linux-arm64-musl	16m 12s
ios_simulator	56s
macOS	35s
ubuntu-20.04 (mavsdk, hunter)	4m 48s
macOS-framework	34s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	5m 6s
ubuntu-22.04 (style and proto check)	1m 30s
ubuntu-20.04 (mavsdk_server, superbuild)	11m 21s
Windows	11m 26s
ubuntu-22.04 (mavsdk_server, superbuild)	10m 10s
iOS XCFramework	0s
	3h 7m 43s

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