error LNK2001: unresolved external symbol log_10_int on Windows

When building bundled MariaDB 10.4.7 with latest storage engine Mroonga http://mroonga.org/ , it causes "error LNK2001: unresolved external symbol log_10_int". [1]
It seems that it requires MYSQL_PLUGIN_IMPORT on Windows.

Here is the patch to fix this issue.

diff -ru mariadb-10.4.7.orig/include/my_time.h mariadb-10.4.7/include/my_time.h
— mariadb-10.4.7.orig/include/my_time.h 2019-07-30 20:32:14.000000000 +0900
+++ mariadb-10.4.7/include/my_time.h 2019-08-26 08:28:59.857378783 +0900
@@ -27,7 +27,7 @@

C_MODE_START

-extern ulonglong log_10_int[20];
+extern MYSQL_PLUGIN_IMPORT ulonglong log_10_int[20];
extern uchar days_in_month[];

#define MY_TIME_T_MAX LONG_MAX

[1] build logs on AppVeyor CI https://ci.appveyor.com/project/groonga/mroonga/builds/26925777/job/aneis43usly9jd6c#L5179