SHARED linking for Geographiclib (#624)

* remove GeographicLib specific linking option

CMakeLists.txt

@@ -34,7 +34,7 @@ endif()
 
 # Geographiclib installs FindGeographicLib.cmake to this non-standard location
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "/usr/share/cmake/geographiclib/")
-find_package(GeographicLib REQUIRED COMPONENTS STATIC)
+find_package(GeographicLib REQUIRED)
 
 # Attempt to find Eigen using its own CMake module.
 # If that fails, fall back to cmake_modules package.