FindPostgreSQL: support macports installation scheme

Macports installs into `include/postgresql${suffix}`. Add this to the
list of supported suffixes. Also copy the non-server
`postgresql/${suffix}` path.

Modules/FindPostgreSQL.cmake

@@ -107,8 +107,11 @@ foreach(suffix ${PostgreSQL_KNOWN_VERSIONS})
     list(APPEND PostgreSQL_LIBRARY_ADDITIONAL_SEARCH_SUFFIXES
         "pgsql-${suffix}/lib")
     list(APPEND PostgreSQL_INCLUDE_ADDITIONAL_SEARCH_SUFFIXES
+        "postgresql${suffix}"
+        "postgresql/${suffix}"
         "pgsql-${suffix}/include")
     list(APPEND PostgreSQL_TYPE_ADDITIONAL_SEARCH_SUFFIXES
+        "postgresql${suffix}/server"
         "postgresql/${suffix}/server"
         "pgsql-${suffix}/include/server")
   endif()