cmake: remove unsupported platform thing, they're now considered unknown

We already renamed “unsupported” as “unknown” so it was just by luck
we didn't stop the build (what we wanted when changing that).

Author: illwieckz

cmake/DaemonArchitecture.cmake

@@ -40,7 +40,7 @@ try_compile(BUILD_RESULT
 # Setting -Werror in CXXFLAGS would produce errors instead of warning
 # but that should not break the architecture detection,
 # so we only print a CMake warning there and use BUILD_LOG content to
-# detect unsupported platforms.
+# detect unknown platforms.
 # Catching compilation error is still useful, for example to detect
 # undefined types, missing header or things like that.
 # Setting USE_WERROR to ON doesn't print this warning.
@@ -60,8 +60,6 @@ if (NOT ARCH)
 		"Missing DAEMON_ARCH, there is a mistake in DaemonArchitecture.cpp\n"
 		"${BUILD_LOG}"
 	)
-elseif(ARCH STREQUAL "unsupported")
-	message(FATAL_ERROR "Architecture not supported")
 endif()
 
 message(STATUS "Detected architecture: ${ARCH}")