MinGW cross compile correction (#340)

diff --git a/usrsctplib/CMakeLists.txt b/usrsctplib/CMakeLists.txt
index 6aa6b02..3194e25 100644
--- a/usrsctplib/CMakeLists.txt
+++ b/usrsctplib/CMakeLists.txt
@@ -171,8 +171,8 @@
 
 if (WIN32)
 	message(STATUS "link library: ws2_32")
-	target_link_libraries(usrsctp ws2_32 Iphlpapi.lib)
-	target_link_libraries(usrsctp-static ws2_32 Iphlpapi.lib)
+	target_link_libraries(usrsctp ws2_32 iphlpapi.lib)
+	target_link_libraries(usrsctp-static ws2_32 iphlpapi.lib)
 endif ()
 
 set_target_properties(usrsctp-static PROPERTIES OUTPUT_NAME "usrsctp")