Add binding for HIGHCONTRAST{A,W} (#815)

Author: davidhewitt

src/um/winuser.rs

@@ -6313,7 +6313,28 @@ STRUCT!{struct ANIMATIONINFO {
     iMinAnimate: c_int,
 }}
 pub type LPANIMATIONINFO = *mut ANIMATIONINFO;
-//12672
+//12638
+STRUCT!{struct HIGHCONTRASTA {
+    cbSize: UINT,
+    dwFlags: DWORD,
+    lpszDefaultScheme: LPSTR,
+}}
+pub type LPHIGHCONTRASTA = *mut HIGHCONTRASTA;
+STRUCT!{struct HIGHCONTRASTW {
+    cbSize: UINT,
+    dwFlags: DWORD,
+    lpszDefaultScheme: LPWSTR,
+}}
+pub type LPHIGHCONTRASTW = *mut HIGHCONTRASTW;
+pub const HCF_HIGHCONTRASTON: DWORD = 0x00000001;
+pub const HCF_AVAILABLE: DWORD = 0x00000002;
+pub const HCF_HOTKEYACTIVE: DWORD = 0x00000004;
+pub const HCF_CONFIRMHOTKEY: DWORD = 0x00000008;
+pub const HCF_HOTKEYSOUND: DWORD = 0x00000010;
+pub const HCF_INDICATOR: DWORD = 0x00000020;
+pub const HCF_HOTKEYAVAILABLE: DWORD = 0x00000040;
+pub const HCF_LOGONDESKTOP: DWORD = 0x00000100;
+pub const HCF_DEFAULTDESKTOP: DWORD = 0x00000200;
 pub const CDS_UPDATEREGISTRY: DWORD = 0x00000001;
 pub const CDS_TEST: DWORD = 0x00000002;
 pub const CDS_FULLSCREEN: DWORD = 0x00000004;