Modifying the ant run target in Linux.

According to a comment at http://code.google.com/p/arduino/issues/detail?id=352 this helps ant find the executable.  It still doesn't work for me, but maybe it will for you.

Author: David A. Mellis

build/build.xml

@@ -315,7 +315,7 @@
 
   <target name="linux-run" depends="linux-build" 
 	  description="Run Linux version">
-    <exec executable="linux/work/arduino" dir="linux/work" spawn="false"/>
+    <exec executable="./arduino" dir="linux/work" spawn="false"/>
   </target>
 
   <target name="linux-dist" depends="linux-build"