check install prefix when search for libraries GEOS, GEOTIFF, TIFF

[rashadkm]

currently Find*.cmake checks for /usr /usr/local

For example GEOS.cmake

But this works only for linux machines and for windows one has to provide -DGEOS_INCLUDE_DIR and -DGEOS_LIBRARY

but cmake could also check CMAKE_INSTALL_PREFIX so in windows OS also OSSIM cmake detects the proper libs and headers automatically during configure.

Another advantage is to use a custom version of these libraries even though one has it installed in /usr or /usr/local

see sample: ​http://trac.osgeo.org/ossim/browser/trunk/ossim_package_support/cmake/CMakeModules/FindGEOS.cmake

All these find cmake sources are in ossim_package_support

[rashadkm]

changeset

​http://trac.osgeo.org/ossim/changeset/23086/