fixes #5018: fix framework links in opencv.pc (MacOS)

cmake/OpenCVGenPkgconfig.cmake

@@ -21,6 +21,8 @@ macro(fix_prefix lst isown)
     endif()
     if(item MATCHES "^-l")
       list(APPEND _lst "${item}")
+    elseif(item MATCHES "^-framework") # MacOS framework (assume single entry "-framework OpenCL")
+      list(APPEND _lst "${item}")
     elseif(item MATCHES "[\\/]")
       get_filename_component(libdir "${item}" PATH)
       get_filename_component(libname "${item}" NAME_WE)