GDAL now requires libgeotiff-cvs

[warmerdam]

============ SECOND ERROR (when compiling GDAL from CVS)============
c++ -c -I../.. -I../../port -I../../core -I../../ogr  -Wall -fPIC -O2
-I/usr/local/src/jpeg-6b -I/usr/local/src/jpeg-6b/include
-I/usr/local/src/tiff-v3.5.7 -I/usr/local/src/tiff-v3.5.7/include
-I/usr/local/lib -I/usr/local/lib/include   -I/usr/local/include gt_wkt_srs.cpp
-o gt_wkt_srs.o
gt_wkt_srs.cpp: In function `enum CPLErr GTIFWktFromMemBuf(int, unsigned char *,
char **, double *, int *, GDAL_GCP **)':
gt_wkt_srs.cpp:1346: implicit declaration of function `int XTIFFClientOpen(...)'
gt_wkt_srs.cpp:1346: assignment to `TIFF *' from `int' lacks a cast
gt_wkt_srs.cpp: In function `enum CPLErr GTIFMemBufFromWkt(const char *, const
double *, int, const GDAL_GCP *, int *, unsigned char **)':
gt_wkt_srs.cpp:1466: assignment to `TIFF *' from `int' lacks a cast
make[2]: *** [gt_wkt_srs.o] Error 1
make[2]: Leaving directory `/usr/local/src/gdal_dev/frmts/gtiff'
make[1]: *** [sub-libs] Error 1
make[1]: Leaving directory `/usr/local/src/gdal_dev/frmts'
make: *** [frmts-target] Error 2 

1) Need to publish new libgeotiff version. 

2) Configure will need to require this version. 

   or we need to disable the memory buffer support when using an old version.

[warmerdam]

A libgeotiff 1.2.1 has been published.

[warmerdam]

I should verify that GDAL's configure tests for a new enough version of libgeotiff
before using the system provided one.  Do this before the 1.2.0 GDAL release. 

[warmerdam]

Configure updated to look for XTIFFClientOpen().  This should ensure it is
libgeotiff 3.6.1 or newer.