Use DEBUG_POSTFIX cmake property to distinguish between debug and release dll #3536

Job	Run time
coverage (ubuntu-20.04)	4m 21s
ubuntu-20.04 (mavsdk_server, superbuild)	11m 12s
ubuntu-22.04 (mavsdk_server, superbuild)	9m 35s
alpine 3.16.0 (musl)	15m 26s
Ubuntu/Debian packaging (Ubuntu 20.04)	7m 35s
ubuntu-20.04 (package, non-mavsdk_server)	6m 18s
ubuntu-22.04 (package, non-mavsdk_server)	5m 15s
android-arm	5m 12s
linux-armv6	4m 58s
android-arm64	5m 9s
linux-armv6-musl	11m 39s
linux-armv7	4m 53s
ios	8m 17s
android-x86	5m 33s
linux-armv7l-musl	11m 47s
linux-arm64	4m 55s
ios_simulator	7m 58s
android-x86_64	5m 9s
linux-arm64-musl	12m 20s
ubuntu-20.04 (mavsdk, hunter)	3m 54s
macOS	11m 55s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	4m 58s
macOS-framework	17m 38s
ubuntu-22.04 (style and proto check)	1m 9s
Windows	10m 45s
iOS XCFramework	1m 18s
	3h 19m 9s

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