[PATCH] Fix reprojection bug in mapwcs.c

[rouault]

This patch fixes a quite annoying bug that was explained by Jerome Martin (see the original thread : ​http://lists.umn.edu/cgi-bin/wa?A2=ind0702&L=mapserver-users&T=0&F=&S=&P=852)

Now, I can make GetCoverage requests on a tileindex of DTED files with resolutions (or dimensions) not necesseraly a multiple of the original resolution, or into another projection system.

The fix consists of adding the following lines after msMapComputeGeotransform, as it's done in mapdraw.c

    /* Do we need to fake out stuff for rotated support? */
    if( map->gt.need_geotransform )
        msMapSetFakedExtent( map );