[patch, fortran, testsuite] Add dg-do directive to advance_3.f90

[Brooks Moses]

Somehow, the dg-do compile directive got left off of advance_3.f90. 
This patch restores it.

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2006-12-18  Brooks Moses  <brooks.moses@codesourcery.com>

	* gfortran.dg/advance_3.f90: Add dg-do compile directive.

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Tested on i686-pc-linux-gnu; committed to trunk and 4.2 as obvious.

- Brooks
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