Two quick problems and solutions when compiling on a new system

For the first time in a long time I compiled mplayer on a newly loaded 
system (Fedora 34) and solved a couple of simple problems that might 
save someone some time and confusion.

It correctly detected that vdpau was present but the mplayer link failed 
with XGetWindowAttributes() missing. It used to be that you could add 
-lX11 to fix this, but that didn't work. The solution was to load the 
libXv-devel package.

The OSD wasn't displaying. That was because the freetype-devel package 
wasn't loaded.
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