[osg-submissions] minor change to osgtext.cpp example to work around GCC 3.2.3 bug

[Philip Lowman]

The examples/osgtext/osgtext.cpp file does not compile for me on gcc 3.2.3
(RHEL3) presumably due to a compiler bug.

A fix is attached.

[ 98%] Building CXX object
examples/osgtext/CMakeFiles/example_osgtext.dir/osgtext.o
/home/lowmanp/svn/OpenSceneGraph/examples/osgtext/osgtext.cpp: In member
   function `void UpdateTextOperation::load()':
/home/lowmanp/svn/OpenSceneGraph/examples/osgtext/osgtext.cpp:549: syntax
error
   before `;' token
/home/lowmanp/svn/OpenSceneGraph/examples/osgtext/osgtext.cpp:560: invalid
   operands of types `osg::Vec3 ()(...)' and `float' to binary `operator*'
make[2]: *** [examples/osgtext/CMakeFiles/example_osgtext.dir/osgtext.o]
Error 1
make[1]: *** [examples/osgtext/CMakeFiles/example_osgtext.dir/all] Error 2
make: *** [all] Error 2
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