Address bug #9296 by adding a switch to disable Python module installation.

Makefile.am

@@ -140,7 +140,7 @@ ACLOCAL_AMFLAGS = -I m4
 
 EXTRA_DIST = config/config.rpath config/mkinstalldirs config/py-compile
 
-if PYTHON
+if PYTHON_INSTALL
 pkgpython_PYTHON = data/tools/wesnoth/wmltools.py \
     data/tools/wesnoth/wmldata.py \
     data/tools/wesnoth/wmlparser.py \

configure.ac

@@ -79,6 +79,11 @@ AC_ARG_ENABLE([python],
 	      [python=$enableval],
 	      [python=yes])
 
+AC_ARG_ENABLE([python_install],
+              AS_HELP_STRING([--disable-python-install], [disable installation of Python developer tools]),
+	      [python_install=$enableval],
+	      [python_install=yes])
+
 AC_ARG_ENABLE([lite],
               AS_HELP_STRING([--enable-lite], [enable lite version of wesnoth (without music or large images)]),
 	      [lite=$enableval],
@@ -241,6 +246,7 @@ AC_ARG_ENABLE([display-revision],
 	      [svnrev=no])
 
 AM_CONDITIONAL([STATIC], [test x$static = xyes])
+AM_CONDITIONAL([PYTHON_INSTALL], [test x$python_install = xyes])
 AM_CONDITIONAL([GAME], [test x$game = xyes])
 AM_CONDITIONAL([SERVER], [test x$server = xyes])
 AM_CONDITIONAL([CAMPAIGNSERVER], [test x$campaignserver = xyes])
@@ -807,19 +813,6 @@ if test "x$lite" = "xno"; then
     fi
 fi
 
-#######################################################################
-# Make UNUSED available for suppressing warnings of unused parameters #
-#######################################################################
-
-AH_VERBATIM([_GNU_SOURCE],
-          [/* Macro for declaring function arguments unused. */
-#if defined(__GNUC__)
-#  define UNUSED __attribute__((unused)) /* Flag variable as unused */
-#else /* not __GNUC__ */
-#  define UNUSED
-#endif
-])
-
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 # Tune gettext stuff for our needs                                    #
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