wscript: decouple dvdnav check from dvdread

Reallows enabling dvdnav without enabling dvdread which was broken
in 77cbb3543 when they were both disabled by default.
Since dvdnav requires dvdread, we can enable dvdread:// even if
--enable-dvdread isn't passed.

Fixes #4290

stream/stream.c

@@ -93,7 +93,7 @@ static const stream_info_t *const stream_list[] = {
 #if HAVE_LIBSMBCLIENT
     &stream_info_smb,
 #endif
-#if HAVE_DVDREAD
+#if HAVE_DVDREAD || HAVE_DVDNAV
     &stream_info_ifo,
     &stream_info_dvd,
 #endif

wscript

@@ -338,8 +338,8 @@ iconv support use --disable-iconv.",
     }, {
         'name': '--dvdnav',
         'desc': 'dvdnav support',
-        'deps': [ 'dvdread' ],
-        'func': check_pkg_config('dvdnav', '>= 4.2.0'),
+        'func': check_pkg_config('dvdnav',  '>= 4.2.0',
+                                 'dvdread', '>= 4.1.0'),
         'default': 'disable',
     }, {
         'name': '--cdda',

wscript_build.py

@@ -260,7 +260,9 @@ def build(ctx):
         ( "stream/stream_cdda.c",                "cdda" ),
         ( "stream/stream_dvb.c",                 "dvbin" ),
         ( "stream/stream_dvd.c",                 "dvdread" ),
+        ( "stream/stream_dvd.c",                 "dvdnav" ),
         ( "stream/stream_dvd_common.c",          "dvdread" ),
+        ( "stream/stream_dvd_common.c",          "dvdnav" ),
         ( "stream/stream_dvdnav.c",              "dvdnav" ),
         ( "stream/stream_edl.c" ),
         ( "stream/stream_file.c" ),