msvcr120: Implement the _vacopy function.

dlls/msvcr120/msvcr120.spec

@@ -1792,7 +1792,7 @@
 @ cdecl _unlock_file(ptr) MSVCRT__unlock_file
 @ cdecl _utime32(str ptr)
 @ cdecl _utime64(str ptr)
-@ stub _vacopy
+@ cdecl _vacopy(ptr ptr) MSVCR120__vacopy
 @ cdecl _vcprintf(str ptr)
 @ stub _vcprintf_l
 @ stub _vcprintf_p

dlls/msvcrt/misc.c

@@ -490,3 +490,11 @@ BOOL CDECL MSVCR110__crtInitializeCriticalSectionEx(
     TRACE("(%p %x %x)\n", cs, spin_count, flags);
     return InitializeCriticalSectionEx(cs, spin_count, flags);
 }
+
+/*********************************************************************
+ * _vacopy (MSVCR120.@)
+ */
+void CDECL MSVCR120__vacopy(__ms_va_list *dest, __ms_va_list src)
+{
+    __ms_va_copy(*dest, src);
+}

include/msvcrt/crtdefs.h

@@ -80,10 +80,16 @@
 #  define __ms_va_list __builtin_ms_va_list
 #  define __ms_va_start(list,arg) __builtin_ms_va_start(list,arg)
 #  define __ms_va_end(list) __builtin_ms_va_end(list)
+#  define __ms_va_copy(dest,src) __builtin_ms_va_copy(dest,src)
 # else
 #  define __ms_va_list va_list
 #  define __ms_va_start(list,arg) va_start(list,arg)
 #  define __ms_va_end(list) va_end(list)
+#  ifdef va_copy
+#   define __ms_va_copy(dest,src) va_copy(dest,src)
+#  else
+#   define __ms_va_copy(dest,src) ((dest) = (src))
+#  endif
 # endif
 #endif
 

include/windef.h

@@ -89,10 +89,16 @@ extern "C" {
 #  define __ms_va_list __builtin_ms_va_list
 #  define __ms_va_start(list,arg) __builtin_ms_va_start(list,arg)
 #  define __ms_va_end(list) __builtin_ms_va_end(list)
+#  define __ms_va_copy(dest,src) __builtin_ms_va_copy(dest,src)
 # else
 #  define __ms_va_list va_list
 #  define __ms_va_start(list,arg) va_start(list,arg)
 #  define __ms_va_end(list) va_end(list)
+#  ifdef va_copy
+#   define __ms_va_copy(dest,src) va_copy(dest,src)
+#  else
+#   define __ms_va_copy(dest,src) ((dest) = (src))
+#  endif
 # endif
 #endif