Ensure that pthreads library gets installed before building anything that depends on it

CMakeLists.txt

@@ -297,6 +297,9 @@ INCLUDE_DIRECTORIES(BEFORE ${CMAKE_CURRENT_SOURCE_DIR}/src)
 
 ADD_LIBRARY(${SHARED_TARGET} SHARED ${SOURCE_FILES} ${SOURCE_INCLUDE_FILES} ${API_ABS_INCLUDE_FILES})
 SET_TARGET_PROPERTIES(${SHARED_TARGET} PROPERTIES COMPILE_FLAGS "-DOPENMM_BUILDING_SHARED_LIBRARY -DLEPTON_BUILDING_SHARED_LIBRARY -DOPENMM_VALIDATE_BUILDING_SHARED_LIBRARY")
+IF(WIN32)
+    ADD_DEPENDENCIES(${SHARED_TARGET} PthreadsLibraries)
+ENDIF(WIN32)
 
 SET(OPENMM_BUILD_STATIC_LIB OFF CACHE BOOL "Whether to build static OpenMM libraries")
 IF(OPENMM_BUILD_STATIC_LIB)