[cups.bugs] [LOW] STR #2470: No error for incorrect ServerBin

[twaugh.redhat]

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[STR New]

If the ServerBin is configured incorrectly (as often seems to happen when
using KDE to configure CUPS), 'lpinfo -v' hangs and gives no response. 
Similarly for 'lpinfo -m'.

Here is a patch to fix that.  It performs a sanity check just before
calling fork(), to make sure that the binary it is about to execute is
executable.

Seen in bug #250840:
  https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=250840

Link: http://www.cups.org/str.php?L2470
Version: 1.3rc2
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