[MPlayer-dev-eng] [PATCH] configure: prevent some shells from crashing

[compn]

passed to me on irc:

<Compn> you just added a space ?
<dmg> Compn: Well, two spaces actually.
<dmg> Compn: The problem is that $(( is shell arithmetic expansion
<dmg> and dash searches the rest of the file looking for the closing ))
<Compn> which shell ?
<dmg> http://en.wikipedia.org/wiki/Debian_Almquist_shell
<Compn> it causes a segfault ?
<dmg> Compn: yes, because dash builds assembles its strings on the
stack using alloca() and evenetually it runs out of space.
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