Adjust to the MSYS2/MinGW static ICU library file renaming

In package mingw-w64-x86_64-icu, version 58.2-3, the names of static
library files were changed, which leads to changes in CMakeLists.txt as
needed for compiling for Windows.

CMakeLists.txt

@@ -800,7 +800,7 @@ endif()
 include_directories(SYSTEM ${Boost_INCLUDE_DIRS})
 if(MINGW)
   set(EXTRA_LIBRARIES mswsock;ws2_32;iphlpapi)
-  set(ICU_LIBRARIES ${Boost_LOCALE_LIBRARY} sicuio sicuin sicuuc sicudt sicutu iconv)
+  set(ICU_LIBRARIES ${Boost_LOCALE_LIBRARY} icuio icuin icuuc icudt icutu iconv)
 elseif(APPLE OR OPENBSD OR ANDROID)
   set(EXTRA_LIBRARIES "")
 elseif(FREEBSD)