Fix Windows-build linking issue and unify CMake files a bit

CMakeLists.txt

@@ -36,6 +36,7 @@ if (MSVC)
   else (EXISTS ${TEST_3RDPARTY_DIR})
     set(MSVC_3RDPARTY_ROOT NOT_FOUND CACHE PATH "Location where the third-party dependencies are extracted")
   endif (EXISTS ${TEST_3RDPARTY_DIR})
+  set( RT_LIBRARY "winmm.lib" )
 else (MSVC)
   set(MSVC_3RDPARTY_ROOT NOT_FOUND CACHE PATH "Location where the third-party dependencies are extracted")
 endif (MSVC)

src/Airports/GenAirports850/CMakeLists.txt

@@ -27,6 +27,7 @@ target_link_libraries(genapts850
 	${SIMGEAR_CORE_LIBRARIES}
 	${SIMGEAR_CORE_LIBRARY_DEPENDENCIES}
 	${GPC_LIBRARY}
-	${NEWMAT_LIBRARY})
+	${NEWMAT_LIBRARY}
+	${RT_LIBRARY})
 
 install(TARGETS genapts850 RUNTIME DESTINATION bin)

src/Prep/TGVPF/CMakeLists.txt

@@ -1,15 +1,11 @@
 
 add_executable(tgvpf tgvpf.cxx)
 
-if(MSVC)
-	set (WINMM_LIB winmm)
-endif(MSVC)
-
 target_link_libraries(tgvpf 
     Polygon Geometry Output poly2tri TriangleJRS vpf
 	${SIMGEAR_CORE_LIBRARIES}
 	${SIMGEAR_CORE_LIBRARY_DEPENDENCIES}
 	${GPC_LIBRARY}
-	${WINMM_LIB})
+	${RT_LIBRARY})
 	
 install(TARGETS tgvpf RUNTIME DESTINATION bin)