Libsvn / APR dependency is removed.

Remove any use of libsubversion / API in Simgear, and always
compile the built-in SVN client code.

CMakeModules/FindSvnClient.cmake

@@ -1,83 +0,0 @@
-# Find Subversion client libraries, and dependencies
-# including APR (Apache Portable Runtime)
-
-include (CheckFunctionExists)
-include (CheckIncludeFile)
-include (CheckLibraryExists)
-
-macro(find_static_component comp libs)
-    # account for alternative Windows svn distribution naming
-    if(MSVC)
-      set(compLib "lib${comp}")
-    else(MSVC)
-      set(compLib "${comp}")
-    endif(MSVC)
-    
-    string(TOUPPER "${comp}" compLibBase)
-    set( compLibName ${compLibBase}_LIBRARY )
-
-    # NO_DEFAULT_PATH is important on Mac - we need to ensure subversion
-    # libraires in dist/ or Macports are picked over the Apple version 
-    # in /usr, since that's what we will ship.
-    # On other platforms we do need default paths though, i.e. since Linux
-    # distros may use architecture-specific directories (like
-    # /usr/lib/x86_64-linux-gnu) which we cannot hardcode/guess here.
-    FIND_LIBRARY(${compLibName}
-if(APPLE)
-      NO_DEFAULT_PATH
-endif(APPLE)
-      NAMES ${compLib}
-      HINTS $ENV{LIBSVN_DIR} ${CMAKE_INSTALL_PREFIX} ${MSVC_3RDPARTY_ROOT}/${MSVC_3RDPARTY_DIR}/lib
-      PATH_SUFFIXES lib64 lib libs64 libs libs/Win32 libs/Win64
-      PATHS ${ADDITIONAL_LIBRARY_PATHS}
-    )
-
-	list(APPEND ${libs} ${${compLibName}})
-endmacro()
-
-find_program(HAVE_APR_CONFIG apr-1-config)
-if(HAVE_APR_CONFIG) 
-        
-    execute_process(COMMAND apr-1-config --cppflags --includes
-        OUTPUT_VARIABLE APR_CFLAGS
-        OUTPUT_STRIP_TRAILING_WHITESPACE)
-        
-    execute_process(COMMAND apr-1-config --link-ld
-        OUTPUT_VARIABLE RAW_APR_LIBS
-        OUTPUT_STRIP_TRAILING_WHITESPACE)
-    
-# clean up some vars, or other CMake pieces complain
-	string(STRIP "${RAW_APR_LIBS}" APR_LIBS)
-
-else(HAVE_APR_CONFIG)
-    message(STATUS "apr-1-config not found, implement manual search for APR")
-endif(HAVE_APR_CONFIG)
-
-if(HAVE_APR_CONFIG OR MSVC)
-	find_path(LIBSVN_INCLUDE_DIR svn_client.h
-      NO_DEFAULT_PATH
-	  HINTS
-	  $ENV{LIBSVN_DIR} ${CMAKE_INSTALL_PREFIX} ${MSVC_3RDPARTY_ROOT}/${MSVC_3RDPARTY_DIR}/include
-	  PATH_SUFFIXES include/subversion-1
-	  PATHS
-      /opt/local
-	  /usr/local
-	  /usr
-	)
-	
-	set(LIBSVN_LIBRARIES "")
-	if (MSVC)
-		find_static_component("apr-1" LIBSVN_LIBRARIES)
-	else (MSVC)
-		list(APPEND LIBSVN_LIBRARIES ${APR_LIBS})
-	endif (MSVC)
-	find_static_component("svn_client-1" LIBSVN_LIBRARIES)
-	find_static_component("svn_subr-1" LIBSVN_LIBRARIES)
-	find_static_component("svn_ra-1" LIBSVN_LIBRARIES)
-
-	include(FindPackageHandleStandardArgs)
-	FIND_PACKAGE_HANDLE_STANDARD_ARGS(LIBSVN DEFAULT_MSG LIBSVN_LIBRARIES LIBSVN_INCLUDE_DIR)
-        if(NOT LIBSVN_FOUND)
-		set(LIBSVN_LIBRARIES "")
-        endif(NOT LIBSVN_FOUND)
-endif(HAVE_APR_CONFIG OR MSVC)