cmake: set RPATH of installed mavsdk_server #4268

Job	Run time
alpine 3.19.0 (musl)	39m 26s
Coverage (ubuntu-22.04)	7m 29s
android-arm	16m 32s
ubuntu-20.04 (package, non-mavsdk_server)	7m 31s
android-arm64	16m 22s
ubuntu-22.04 (package, non-mavsdk_server)	6m 38s
linux-armv6	6m 59s
android-x86	17m 7s
ubuntu-24.04 (package, non-mavsdk_server)	6m 49s
linux-armv7	7m 0s
linux-armv6-musl	37m 56s
android-x86_64	16m 24s
linux-arm64	7m 13s
linux-armv7l-musl	38m 55s
linux-arm64-lts	7m 22s
linux-arm64-musl	41m 32s
ios	1m 33s
macOS x64	18m 20s
ios_simulator_x64	39m 8s
macOS arm64	23m 27s
ios_simulator_arm64	1m 20s
ubuntu-24.04 (style and proto check)	27m 46s
ubuntu-20.04 (non-mavsdk_server, hunter)	4m 47s
macOS framework x64	15m 33s
ubuntu-22.04 (non-mavsdk_server, hunter)	4m 26s
macOS framework arm64	23m 20s
ubuntu-24.04 (non-mavsdk_server, hunter)	4m 22s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	1s
ubuntu-20.04 (mavsdk_server, superbuild)	13m 37s
ubuntu-22.04 (non-mavsdk_server, non-superbuild)	5m 46s
Windows	13m 35s
ubuntu-22.04 (mavsdk_server, superbuild)	39m 39s
ubuntu-24.04 (non-mavsdk_server, non-superbuild)	5m 7s
ubuntu-24.04 (mavsdk_server, superbuild)	12m 54s
ubuntu-24.04 (mavsdk_server, superbuild)	12m 21s
ubuntu-24.04 (mavsdk_server, superbuild)	44m 0s
iOS XCFramework	0s
	9h 52m 17s

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