MinGW: Update library prefix/suffix

- Use "lib{library}.dll.a" for import libraries
- Use "{library.dll}" for shared libraries

See msys2/MINGW-packages#20024 (comment)

Author: qmfrederik

Diff for: CMakeLists.txt

@@ -22,8 +22,9 @@ enable_language(OBJC OBJCXX)
 
 if (MINGW)
 	set(CMAKE_IMPORT_LIBRARY_SUFFIX ".dll.a")
+	set(CMAKE_IMPORT_LIBRARY_PREFIX "lib")
 	set(CMAKE_LINK_LIBRARY_SUFFIX "")
-	set(CMAKE_SHARED_LIBRARY_PREFIX "lib")
+	set(CMAKE_SHARED_LIBRARY_PREFIX "")
 	set(CMAKE_OBJCXX_IMPLICIT_INCLUDE_DIRECTORIES ${CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES})
 endif ()