gdal does not write GCPProjection to geotiff

[schut@…]

When creating a geotiff with gcp's, the gcp projection is not written into the tiff file. This is a regression from 1.3.1, where it *was* being written correctly. Tested with 1.3.2 and cvs version.

This is a simple python testcase:
#=================start python code=================
#!/usr/bin/python
import gdal
import osr

gtiffDriver = gdal.GetDriverByName("GTiff")
testDataset = gtiffDriver.Create("test.tif", 1, 1, 1)
testGCP = gdal.GCP()
testProjection = osr.GetWellKnownGeogCSAsWKT("EPSG:4326")
print testProjection
testDataset.SetGCPs([testGCP], testProjection)
#=================end python code=================

running gdalinfo on the resulting test.tif shows the gcp, but with an empty projection string.

[warmerdam]

I have corrected this in geotiff.cpp. 

There was some very funky in the code for flushing out gcps and their
projection. 

[schut@…]

Fix confirmed by bug submitter.
Thanks!