Properly handle the thread library.

src/xpdev/CMakeLists.txt

@@ -91,20 +91,21 @@ elseif(CMAKE_SYSTEM_NAME STREQUAL "Haiku")
 	target_link_libraries(xpdev m)
 	target_link_libraries(xpdev network)
 elseif(CMAKE_SYSTEM_NAME STREQUAL "NetBSD")
-	target_link_libraries(xpdev ossaudio pthread)
+	target_link_libraries(xpdev ossaudio)
 elseif(CMAKE_SYSTEM_NAME STREQUAL "OpenBSD")
-	target_link_libraries(xpdev ossaudio pthread)
+	target_link_libraries(xpdev ossaudio)
 elseif(CMAKE_SYSTEM_NAME STREQUAL "SunOS")
-	target_link_libraries(xpdev socket pthread)
+	target_link_libraries(xpdev socket)
 elseif(CMAKE_SYSTEM_NAME STREQUAL "OS X")
-	target_link_libraries(xpdev pthread)
+	target_link_libraries(xpdev)
 elseif(CMAKE_SYSTEM_NAME STREQUAL "QNX")
-	target_link_libraries(xpdev pthread)
+	target_link_libraries(xpdev)
 elseif(CMAKE_SYSTEM_NAME STREQUAL "Linux")
-	target_link_libraries(xpdev pthread)
+	target_link_libraries(xpdev)
 elseif(WIN32)
 	target_link_libraries(xpdev ws2_32 winmm)
 endif()
+target_link_libraries(xpdev ${CMAKE_THREAD_LIBS_INIT})
 
 if(EXISTS /dev/urandom)
 	target_compile_definitions(xpdev PRIVATE HAS_DEV_URANDOM URANDOM_DEV="/dev/urandom")