Add missing IMPORTED_IMPLIB for dav1d which creates a CMake warning. (#2112)

diff --git a/cmake/Modules/Finddav1d.cmake b/cmake/Modules/Finddav1d.cmake
index 1e4cabc..62dfb02 100644
--- a/cmake/Modules/Finddav1d.cmake
+++ b/cmake/Modules/Finddav1d.cmake
@@ -48,6 +48,8 @@
     else()
         add_library(dav1d::dav1d SHARED IMPORTED GLOBAL)
     endif()
-    set_target_properties(dav1d::dav1d PROPERTIES IMPORTED_LOCATION "${DAV1D_LIBRARY}" IMPORTED_SONAME dav1d)
+    set_target_properties(
+        dav1d::dav1d PROPERTIES IMPORTED_LOCATION "${DAV1D_LIBRARY}" IMPORTED_SONAME dav1d IMPORTED_IMPLIB "${DAV1D_LIBRARY}"
+    )
     target_include_directories(dav1d::dav1d INTERFACE ${DAV1D_INCLUDE_DIR})
 endif()