Solved mplayer-1.5.0.20250816_2 fails to build

[trev]

libmpcodecs/vd_ffmpeg.c:287:45: warning: call to undeclared function 'av_alloc_vdpaucontext'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
  287 |             avctx->hwaccel_context = vdpc = av_alloc_vdpaucontext();
      |                                             ^
libmpcodecs/vd_ffmpeg.c:287:43: error: incompatible integer to pointer conversion assigning to 'AVVDPAUContext *' (aka 'struct AVVDPAUContext *') from 'int' [-Wint-conversion]
  287 |             avctx->hwaccel_context = vdpc = av_alloc_vdpaucontext();
      |                                           ^ ~~~~~~~~~~~~~~~~~~~~~~~

Solution: disable video acceleration in the mplayer configuration (VDPAU).

Ref: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291932