Fix linking with CMake >= 3.27 due to changes [1] in the FindEXPAT module.

[1] https://github.com/Kitware/CMake/commit/13079f382b480c8fe6a68d98afc2cec716a75e59

--- src/kml/base/CMakeLists.txt.orig	2017-01-15 08:52:06 UTC
+++ src/kml/base/CMakeLists.txt
@@ -49,4 +49,4 @@ build_target(
   SRCS ${SRCS}
   INCS ${INCS}
   DEPENDS ${KMLBASE_DEPENDS}
-  LINKS ${ZLIB_LIBRARY} ${MINIZIP_LIBRARIES} ${URIPARSER_LIBRARY} ${EXPAT_LIBRARY} )
+  LINKS ${ZLIB_LIBRARY} ${MINIZIP_LIBRARIES} ${URIPARSER_LIBRARY} EXPAT::EXPAT )