Implementation functions for INLINE_SIMPLE_STRUCTS for docbook output

The implementation of the `INLINE_SIMPLE_STRUCTS` functions was missing for docbook.
The problem shows up when using e.g.
```
/** \file */

/** outer */
struct Outer
{
  /** foo */
  union Foo
  {
    /** Bar */
    struct FooFlags
    {
      bool cond1; /*!< \brief bar 1
                   *   \details details1 bar 1
                   */
      bool cond2; /*!< bar 2 */
    } flags; /*!< \brief foo bar
              *   \details details2 of foo bar
              */
  } myMember; /*!< public member */
private:
  void myWork(); /*!< private member function */
};
```
with
```
INLINE_SIMPLE_STRUCTS  = YES
QUIET=YES
GENERATE_DOCBOOK=YES
```

Note with the `INLINE_SIMPLE_STRUCTS` there is also a mismatch with the opening  and closing `section` tags, but that is unrelated to this implementation(in this case is is "solved" by adding a closing section tag to struct_outer.xml and removing the last closing section tag from structs_8hpp.xml

1 files changed, 9 insertions, 8 deletions

diff --git a/src/docbookgen.h b/src/docbookgen.h
index f2c00bf..4c92678 100644
--- a/src/docbookgen.h
+++ b/src/docbookgen.h
@@ -321,14 +321,14 @@ class DocbookGenerator : public OutputGenerator
     void endConstraintDocs();
     void endConstraintList();
 
-    void startMemberDocSimple(bool){DB_GEN_NEW};
-    void endMemberDocSimple(bool){DB_GEN_NEW};
-    void startInlineMemberType(){DB_GEN_NEW};
-    void endInlineMemberType(){DB_GEN_NEW};
-    void startInlineMemberName(){DB_GEN_NEW};
-    void endInlineMemberName(){DB_GEN_NEW};
-    void startInlineMemberDoc(){DB_GEN_NEW};
-    void endInlineMemberDoc(){DB_GEN_NEW};
+    void startMemberDocSimple(bool);
+    void endMemberDocSimple(bool);
+    void startInlineMemberType();
+    void endInlineMemberType();
+    void startInlineMemberName();
+    void endInlineMemberName();
+    void startInlineMemberDoc();
+    void endInlineMemberDoc();
 
     void startLabels();
     void writeLabel(const QCString &,bool);
@@ -349,6 +349,7 @@ private:
     bool m_inListItem[20] = { false, };
     bool m_inSimpleSect[20] = { false, };
     bool m_descTable = false;
+    bool m_simpleTable = false;
     int m_inLevel = -1;
     bool m_firstMember = false;
 };