* gnu/packages/patches/libgeotiff-adapt-test-script-for-proj-6.2.patch:
New file.
* gnu/local.mk (dist_patch_DATA): Register it.
* gnu/packages/geo.scm (libgeotiff): Update to 1.5.1.
[inputs]: Replace proj.4 with proj.
[sources]: Add libgeotiff-adapt-test-script-for-proj-6.2.patch
to patches.