meson: Bug fix. Define meson variable even when option is disabled.

modules/access/meson.build

@@ -9,8 +9,8 @@ vlc_modules += {
 }
 
 decklink_dep = disabler()
-if get_option('decklink').allowed()
 decklink_cpp_args = []
+if get_option('decklink').allowed()
 if host_system == 'windows'
     decklink_cpp_args += libcom_cppflags
 endif

modules/codec/meson.build

@@ -102,8 +102,8 @@ vlc_modules += {
 }
 
 # libmad codec
-if get_option('mad').allowed()
 mad_dep = disabler()
+if get_option('mad').allowed()
 # TODO add support for a custom folder for libmad
 if cc.check_header('mad.h')
     mad_dep = cc.find_library('mad')

modules/demux/meson.build

@@ -405,8 +405,8 @@ vlc_modules += {
 }
 
 # mpc
-if get_option('mpc').allowed()
 mpc_dep = disabler()
+if get_option('mpc').allowed()
 if cc.check_header('mpc/mpcdec.h')
     mpc_dep = cc.find_library('mpcdec')
     cdata.set('HAVE_MPC_MPCDEC_H', 1)

modules/hw/nvdec/meson.build

@@ -1,5 +1,5 @@
-if get_option('nvdec').allowed()
 nvdec_dep = disabler()
+if get_option('nvdec').allowed()
 if cc.check_header('ffnvcodec/dynlink_loader.h')
     nvdec_dep = enabler()
 elif cc.check_header('ffnvcodec/dynlink_loader.h', dependencies: contrib_dep )