[RELEASE v1.4] Backport disable -ffast-math for iOS #3516

Job	Run time
ubuntu-20.04 (package, non-mavsdk_server)	5m 44s
coverage (ubuntu-20.04)	3m 7s
Ubuntu/Debian packaging (Ubuntu 20.04)	4m 15s
alpine 3.11.6 (musl)	14m 8s
android-arm	4m 44s
linux-armv6	4m 7s
android-arm64	4m 41s
manylinux2010-x64	5m 42s
linux-armv7	4m 55s
linux-armv6-musl	10m 30s
android-x86	6m 18s
linux-arm64	5m 0s
android-x86_64	6m 39s
linux-armv7l-musl	10m 34s
linux-arm64-musl	8m 33s
ios	12m 44s
ios_simulator	12m 25s
macOS	20m 9s
fedora-34 (package, non-mavsdk_server)	5m 59s
macOS-framework	19m 51s
ubuntu-20.04 (check style and docs)	5m 8s
ubuntu-20.04 (mavsdk, hunter)	3m 1s
fedora-35 (package, non-mavsdk_server)	6m 26s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	2m 59s
ubuntu-20.04 (proto check)	54s
ubuntu-20.04 (mavsdk_server, superbuild)	11m 14s
Windows	7m 41s
iOS XCFramework	0s
	3h 27m 28s

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