configure: Add possibility to exclude some directories from the generated lists.

aclocal.m4

@@ -168,14 +168,16 @@ AC_CONFIG_FILES([$1])])
 
 dnl **** Create a makefile from config.status ****
 dnl
-dnl Usage: WINE_CONFIG_MAKEFILE(file,deps,prefix,var)
+dnl Usage: WINE_CONFIG_MAKEFILE(file,deps,prefix,var,enable)
 dnl
 AC_DEFUN([WINE_CONFIG_MAKEFILE],
 [m4_pushdef([ac_dir],m4_bpatsubst([$1],[^\($3/?\(.*\)/\)?Makefile$],[\2]))dnl
 m4_ifval(ac_dir,[ALL_MAKEFILES="$ALL_MAKEFILES \\
 	$1"])
-m4_ifval([$4],[$4="$[$4] \\
+AS_VAR_PUSHDEF([ac_enable],m4_default([$5],[enable_]ac_dir))dnl
+m4_ifval([$4],[test "x$ac_enable" != xno && $4="$[$4] \\
 	ac_dir"])
+AS_VAR_POPDEF([ac_enable])dnl
 ALL_MAKEFILE_DEPENDS="$ALL_MAKEFILE_DEPENDS
 [$1: ]m4_ifval([$2],[$1.in $2],[$1.in])"
 AC_CONFIG_FILES([$1])dnl