[RELEASE v1.4] Backport disable -ffast-math for iOS #3513

Job	Run time
Ubuntu/Debian packaging (Ubuntu 20.04)	6m 24s
ubuntu-20.04 (package, non-mavsdk_server)	4m 11s
coverage (ubuntu-20.04)	4m 0s
alpine 3.11.6 (musl)	8m 29s
android-arm	4m 29s
linux-armv6	3m 15s
linux-armv6-musl	13m 20s
android-arm64	8m 40s
manylinux2010-x64	8m 59s
linux-armv7	5m 10s
linux-armv7l-musl	8m 10s
android-x86	6m 21s
linux-arm64	3m 15s
linux-arm64-musl	10m 57s
android-x86_64	4m 44s
ios	17m 22s
macOS	14m 50s
ios_simulator	16m 49s
ubuntu-20.04 (check style and docs)	3m 23s
fedora-34 (package, non-mavsdk_server)	6m 35s
macOS-framework	15m 11s
fedora-35 (package, non-mavsdk_server)	3m 48s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	3m 1s
ubuntu-20.04 (mavsdk, hunter)	4m 8s
ubuntu-20.04 (proto check)	1m 2s
ubuntu-20.04 (mavsdk_server, superbuild)	7m 28s
Windows	8m 38s
iOS XCFramework	0s
	3h 22m 39s

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