[SCM] libav/experimental: Use $(command) instead of `command`, it's POSIX, clearer and already used.

[siretart at users.alioth.debian.org]

The following commit has been merged in the experimental branch:
commit b966340546c84dfaf83bbaa1d5f8c8570eb8a2f3
Author: Diego Biurrun <diego at biurrun.de>
Date:   Sun Apr 1 13:06:41 2007 +0000

    Use $(command) instead of `command`, it's POSIX, clearer and already used.
    
    Originally committed as revision 8586 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/configure b/configure
index 7f4543c..12f2877 100755
--- a/configure
+++ b/configure
@@ -750,7 +750,7 @@ mmi="default"
 bigendian="no"
 
 # OS
-targetos=`tolower \` uname -s\` `
+targetos=$(tolower $(uname -s))
 beos_netserver="no"
 os2="no"
 wince="no"

-- 
Libav/FFmpeg packaging