configure: Simplify MMAL check

configure

@@ -4678,13 +4678,12 @@ enabled libx265           && require_pkg_config x265 x265.h x265_api_get &&
 enabled libxavs           && require libxavs "stdint.h xavs.h" xavs_encoder_encode -lxavs
 enabled libxvid           && require libxvid xvid.h xvid_global -lxvidcore
 enabled mmal              && { check_lib interface/mmal/mmal.h mmal_port_connect -lmmal_core -lmmal_util -lmmal_vc_client -lbcm_host ||
-                                { ! enabled cross_compile && {
-                                    add_cflags -isystem/opt/vc/include/ -isystem/opt/vc/include/interface/vmcs_host/linux -isystem/opt/vc/include/interface/vcos/pthreads -fgnu89-inline ;
-                                    add_extralibs -L/opt/vc/lib/ -lmmal_core -lmmal_util -lmmal_vc_client -lbcm_host ;
-                                    check_lib interface/mmal/mmal.h mmal_port_connect ; }
-                                check_lib interface/mmal/mmal.h mmal_port_connect ; } ||
-                               die "ERROR: mmal not found"; }
-enabled mmal && check_func_headers interface/mmal/mmal.h "MMAL_PARAMETER_VIDEO_MAX_NUM_CALLBACKS"
+                               { ! enabled cross_compile &&
+                                 add_cflags -isystem/opt/vc/include/ -isystem/opt/vc/include/interface/vmcs_host/linux -isystem/opt/vc/include/interface/vcos/pthreads -fgnu89-inline &&
+                                 add_ldflags -L/opt/vc/lib/ &&
+                                 check_lib interface/mmal/mmal.h mmal_port_connect -lmmal_core -lmmal_util -lmmal_vc_client -lbcm_host; } ||
+                               die "ERROR: mmal not found" &&
+                               check_func_headers interface/mmal/mmal.h "MMAL_PARAMETER_VIDEO_MAX_NUM_CALLBACKS"; }
 enabled omx_rpi && enable omx
 enabled omx               && { check_header OMX_Core.h ||
                                 { ! enabled cross_compile && enabled omx_rpi && {