Missing change in gcc10 patch

wine-5.0-gcc10.patch

@@ -165,6 +165,17 @@
  static HINSTANCE shdoclc = NULL;
  static WCHAR *status_strings[IDS_STATUS_LAST-IDS_STATUS_FIRST+1];
  static IMultiLanguage2 *mlang;
+--- a/dlls/msi/msipriv.h	2020-01-21 11:03:21.000000000 -0600
++++ b/dlls/msi/msipriv.h	2020-01-22 15:40:15.362792925 -0600
+@@ -42,7 +42,7 @@
+ #include "winemsi.h"
+
+ static const BOOL is_64bit = sizeof(void *) > sizeof(int);
+-BOOL is_wow64 DECLSPEC_HIDDEN;
++extern BOOL is_wow64 DECLSPEC_HIDDEN;
+
+ #define MSI_DATASIZEMASK 0x00ff
+ #define MSITYPE_VALID    0x0100
 --- a/dlls/msi/msi.c	2020-01-21 11:03:21.000000000 -0600
 +++ b/dlls/msi/msi.c	2020-01-22 15:42:12.934090382 -0600
 @@ -51,6 +51,8 @@