* configure.in (GNOME_COMPILE_WARNINGS): New check.
(PYTHON_EXEC_PREFIX): Figure out `exec_prefix'
where python was installed.
(PYTHON_LIB_LOC): Use $PYTHON_EXEC_PREFIX instead of
$PYTHON_PREFIX.

* src/Makefile.am (CFLAGS): Comment out.
* plugins/sample/Makefile.am (CFLAGS): Likewise.

* plugins/python/Makefile.am (CFLAGS): Comment out.
(libpython_la_LDFLAGS): Move $(PYTHON_LIB_LOC) here.