configure: Add "missing-braces nonnull parentheses uninitialized address enum-compare undef comment switch" to the list of warnings that should not appear anymore in source code.

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

This fixes some const qualifier violation in modules.

This was a bit too early.

This reverts commit b827afa2.

Conflicts:

	configure.ac

This reverts commit 66341140 and correctly undefine out: if needed.