cmake: fix build for mingw cross compile

- Change normaliz lib name to all lowercase.

This is from a standing patch in vcpkg:
Mingw has libnormaliz.a. For case-sensitive file systems (e.g. cross
builds from Linux), the spelling must match exactly.

Closes #9084

CMakeLists.txt

@@ -688,7 +688,7 @@ endif()
 if(WIN32)
   option(USE_WIN32_IDN "Use WinIDN for IDN support" OFF)
   if(USE_WIN32_IDN)
-    list(APPEND CURL_LIBS "Normaliz")
+    list(APPEND CURL_LIBS "normaliz")
     set(WANT_IDN_PROTOTYPES ON)
   endif()
 endif()