winex11: Remove no longer used declarations.

dlls/winex11.drv/graphics.c

@@ -1643,18 +1643,6 @@ static char *get_icm_profile( unsigned long *size )
     return ret;
 }
 
-typedef struct
-{
-    unsigned int unknown[6];
-    unsigned int state[5];
-    unsigned int count[2];
-    unsigned char buffer[64];
-} sha_ctx;
-
-extern void WINAPI A_SHAInit( sha_ctx * );
-extern void WINAPI A_SHAUpdate( sha_ctx *, const unsigned char *, unsigned int );
-extern void WINAPI A_SHAFinal( sha_ctx *, unsigned char * );
-
 static const WCHAR mntr_key[] =
     {'\\','R','e','g','i','s','t','r','y','\\','M','a','c','h','i','n','e','\\',
      'S','o','f','t','w','a','r','e','\\','M','i','c','r','o','s','o','f','t','\\',