Bugfix: add OH_Ext api for libbegetutil.z.so

Signed-off-by: Nhandyohos <zhangxiaotian@huawei.com>
Change-Id: I7eae4edb4b177fa79168b8ca3988720f2caba895

#I78Q8X

interfaces/innerkits/libbegetutil.versionscript

@@ -142,6 +142,7 @@
     GetFeatureVersion;
     GetMajorVersion;
     GetSeniorVersion;
+    OH_Ext*;
   local:
     *;
 };
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