misc: Fix warnings on Cerbero MinGW

misc: Fix warnings on Cerbero MinGW

gstladspa.c:360:5: error: zero-length ms_printf format string [-Werror=format-zero-length]

vad_private.c:108:3: error: this decimal constant is unsigned only in ISO C90 [-Werror]

gstdecklinkvideosink.cpp:478:32: error: comparison between 'BMDTimecodeFormat {aka enum _BMDTimecodeFormat}' and 'enum GstDecklinkTimecodeFormat' [-Werror=enum-compare]

win/DeckLinkAPI_i.c:72:8: error: extra tokens at end of #endif directive [-Werror]

win/DeckLinkAPIDispatch.cpp:35:10: error: unused variable 'res' [-Werror=unused-variable]

gstwasapiutil.c:733:3: error: format '%x' expects argument of type 'unsigned int', but argument 8 has type 'DWORD' [-Werror=format]
gstwasapiutil.c:733:3: error: format '%x' expects argument of type 'unsigned int', but argument 9 has type 'guint64' [-Werror=format]

kshelpers.c:446:3: error: missing braces around initializer [-Werror=missing-braces]
kshelpers.c:446:3: error: (near initialization for 'known_property_sets[0].guid.Data4') [-Werror=missing-braces]