Build - fix sp_midi and sp_link .dll output location on Windows

Thanks so much to @lilyinstarlight for the suggestion for this fix.

Author: samaaron

app/external/sp_link/CMakeLists.txt

@@ -78,6 +78,8 @@ endif(MSVC)
 
 if(APPLE)
   install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/libsp_link.dylib DESTINATION ${CMAKE_INSTALL_PREFIX} RENAME libsp_link.so)
+elseif(MSVC)
+  install(TARGETS libsp_link RUNTIME DESTINATION ${CMAKE_INSTALL_PREFIX})
 else()
   install(TARGETS libsp_link LIBRARY DESTINATION ${CMAKE_INSTALL_PREFIX})
 endif()

app/external/sp_midi/CMakeLists.txt

@@ -94,6 +94,8 @@ endif(MSVC)
 
 if(APPLE)
   install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/libsp_midi.dylib DESTINATION ${CMAKE_INSTALL_PREFIX} RENAME libsp_midi.so)
+elseif(MSVC)
+  install(TARGETS libsp_midi RUNTIME DESTINATION ${CMAKE_INSTALL_PREFIX})
 else()
   install(TARGETS libsp_midi LIBRARY DESTINATION ${CMAKE_INSTALL_PREFIX})
 endif()