Meta: Install PCI and USB ID files directly into /res

The install() command used by 1e36d5449304226b097a4929a90f846c0ddf1d76
installs the provided file into the *directory* named by the DESTINATION
parameter. So if we ask it to install pci.ids to /res/pci.ids, the final
destination will be /res/pci.ids/pci.ids.

CMakeLists.txt

@@ -248,9 +248,9 @@ export_components("${CMAKE_BINARY_DIR}/components.ini")
 set(PCI_IDS_FILE pci.ids)
 set(PCI_IDS_URL "https://pci-ids.ucw.cz/v2.2/${PCI_IDS_FILE}")
 set(PCI_IDS_DOWNLOAD_PATH "${SERENITY_CACHE_DIR}/${PCI_IDS_FILE}")
-set(PCI_IDS_INSTALL_PATH "${CMAKE_STAGING_PREFIX}/${CMAKE_INSTALL_DATAROOTDIR}/${PCI_IDS_FILE}")
+set(PCI_IDS_INSTALL_PATH "${CMAKE_STAGING_PREFIX}/${CMAKE_INSTALL_DATAROOTDIR}")
 
-if (ENABLE_PCI_IDS_DOWNLOAD AND NOT EXISTS "${PCI_IDS_INSTALL_PATH}")
+if (ENABLE_PCI_IDS_DOWNLOAD AND NOT EXISTS "${PCI_IDS_INSTALL_PATH}/${PCI_IDS_FILE}")
     download_file("${PCI_IDS_URL}" "${PCI_IDS_DOWNLOAD_PATH}")
     install(FILES "${PCI_IDS_DOWNLOAD_PATH}" DESTINATION "${PCI_IDS_INSTALL_PATH}")
 endif()
@@ -258,9 +258,9 @@ endif()
 set(USB_IDS_FILE usb.ids)
 set(USB_IDS_URL "http://www.linux-usb.org/${USB_IDS_FILE}")
 set(USB_IDS_DOWNLOAD_PATH "${SERENITY_CACHE_DIR}/${USB_IDS_FILE}")
-set(USB_IDS_INSTALL_PATH "${CMAKE_STAGING_PREFIX}/${CMAKE_INSTALL_DATAROOTDIR}/${USB_IDS_FILE}")
+set(USB_IDS_INSTALL_PATH "${CMAKE_STAGING_PREFIX}/${CMAKE_INSTALL_DATAROOTDIR}")
 
-if (ENABLE_USB_IDS_DOWNLOAD AND NOT EXISTS "${USB_IDS_INSTALL_PATH}")
+if (ENABLE_USB_IDS_DOWNLOAD AND NOT EXISTS "${USB_IDS_INSTALL_PATH}/${USB_IDS_FILE}")
     download_file("${USB_IDS_URL}" "${USB_IDS_DOWNLOAD_PATH}")
     install(FILES "${USB_IDS_DOWNLOAD_PATH}" DESTINATION "${USB_IDS_INSTALL_PATH}")
 endif()