[Bug-gnubg] Problem with recent changes

[Philippe Michel]

Some recent changes (probably "Move relational code out of database.py and 
into relational.c", 2 days ago) broke gnubg build if it is configured 
--without-python :

gnubg.o(.text+0xe0d): In function `Shutdown':
/home/pm/src/gnubg/gnubg.c:3735: undefined reference to `PythonShutdown'
gnubg.o(.text+0x1b49): In function `CommandLoadPython':
/home/pm/src/gnubg/gnubg.c:4151: undefined reference to `LoadPythonFile'
gnubg.o(.text+0x3bac): In function `HandleCommand':
/home/pm/src/gnubg/gnubg.c:2607: undefined reference to `PythonRun'
relational.o(.text+0x1984): In function `CommandRelationalSelect':
/home/pm/src/gnubg/relational.c:762: undefined reference to `GtkShowQuery'
gtkgame.o(.data+0x880): In function `SkillMenu':
/home/pm/src/gnubg/gtkgame.c:684: undefined reference to 
`GtkRelationalAddMatch'
gtkgame.o(.data+0x898):/home/pm/src/gnubg/gtkgame.c:678: undefined 
reference to `GtkShowRelational'
gtkgame.o(.data+0x8b0):/home/pm/src/gnubg/gtkgame.c:692: undefined 
reference to `GtkRelationalSetup'
*** Error code 1