headers: winnt.h: remove constant SUBLANG_TIBETAN_BHUTAN

This constant is not present in winnt.h from recent Windows SDKs.

This constant has value 0x02; LCID locale created with

	MAKELANGID (LANG_TIBETAN, SUBLANG_TIBETAN_BHUTAN)

is not a valid locale on recent Windows versions.

Signed-off-by: LIU Hao <lh_mouse@126.com>

mingw-w64-headers/include/winnt.h

diff --git a/mingw-w64-headers/include/winnt.h b/mingw-w64-headers/include/winnt.h
index 03789ab..c7a6a95 100644
--- a/mingw-w64-headers/include/winnt.h
+++ b/mingw-w64-headers/include/winnt.h
@@ -1333,7 +1333,6 @@
 #define SUBLANG_TELUGU_INDIA                      0x01
 #define SUBLANG_THAI_THAILAND                     0x01
 #define SUBLANG_TIBETAN_PRC                       0x01
-#define SUBLANG_TIBETAN_BHUTAN                    0x02
 #define SUBLANG_TIGRIGNA_ERITREA                  0x02
 #define SUBLANG_TIGRINYA_ERITREA                  0x02
 #define SUBLANG_TIGRINYA_ETHIOPIA                 0x01