gnu: libgaiagraphics: Remove package.

The libgaiagraphics package was deprecated upstream in 2014 in favor of
librasterlite2 and after the update of spatialite-gui there are no more
packages that depend on it.

* gnu/packages/geo.scm (libgaiagraphics): Remove variable.

Signed-off-by: Guillaume Le Vaillant <glv@posteo.net>

gnu/packages/geo.scm

@@ -294,36 +294,6 @@ and driving.")
     (home-page "https://wiki.gnome.org/Apps/Maps")
     (license license:gpl2+)))
 
-(define-public libgaiagraphics
-  (package
-    (name "libgaiagraphics")
-    (version "0.5")
-    (source
-     (origin
-       (method url-fetch)
-       (uri (string-append "https://www.gaia-gis.it/gaia-sins/libgaiagraphics-"
-                           version ".tar.gz"))
-       (sha256
-        (base32
-         "076afqv417ag3hfvnif0qc7qscmnq1dsf6y431yygwgf34rjkayc"))))
-    (build-system gnu-build-system)
-    (native-inputs
-     `(("pkg-config" ,pkg-config)))
-    (inputs
-     `(("cairo" ,cairo)
-       ("libpng" ,libpng)
-       ("libjpeg-turbo" ,libjpeg-turbo)
-       ("libtiff" ,libtiff)
-       ("libgeotiff" ,libgeotiff)
-       ("proj.4" ,proj.4)
-       ("libxml2" ,libxml2)
-       ("zlib" ,zlib)))
-     (synopsis "Gaia common graphics support")
-     (description "libgaiagraphics is a library supporting
- common-utility raster handling methods.")
-    (home-page "https://www.gaia-gis.it/fossil/libgaiagraphics/index")
-    (license license:lgpl3+)))
-
 (define-public libgeotiff
   (package
     (name "libgeotiff")