[MPlayer-dev-eng] [PATCH] configure: much faster configure --help

[Erik Auerswald]

Hi,

MPlayer's configure does a lot of work before checking command line 
options. This includes updating of an ffmpeg git repository before 
producing help output, even when only asked for help.

The attached patch rearranges configure's help output code to be in 
front of ffmpeg repo checks and updates and introduces a new check, if 
the first command line option is --help or -h and prints the help 
immediately.

This drastically speeds up checking for available configure options, if 
done the common way of "./configure --help". If the --help resp. -h 
option is somewhere else on configure's command line, the (kept) 
existing check will find this after doing all the initial setup work, 
taking much longer overall.

Erik
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