Renamed CallTo16* functions to wine_call_to_16* and export them from
kernel32.spec.

diff --git a/misc/system.c b/misc/system.c
index 82473e3..d0a1675 100644
--- a/misc/system.c
+++ b/misc/system.c
@@ -136,7 +136,7 @@
 
     AX_reg( &context ) = timer;
 
-    CallTo16RegisterShort( &context, 0 );
+    wine_call_to_16_regs_short( &context, 0 );
 }
 
 WORD WINAPI WIN16_CreateSystemTimer( WORD rate, FARPROC16 proc )