[rtmpdump] Race condition in the librtmp make install.

[orbea]

Hi,

When building rtmpdump sometimes 'make install' will fail.

This is because the install_so rule depends on the $(SODIR) directory,
but this directory is created in the install_base rule instead. With
parallel make the file may be copied before the directory exists which
obviously will not work. Please see the attached rtmpdump-build.log.

This can be easily solved by making sure the $(SODIR) directory is
created in the install_so rule instead and I have attached a patch
which does this.

Can this please be merged to the rtmpdump git?

https://git.ffmpeg.org/rtmpdump.git

Some distros will create the directory before invoking 'make install'
as a workaround.

Thanks!
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