Update makedocbook for bd547490

Teach makedocbook how to handle some new things seen in the makedoc markup
since bd547490:

- struct lines appearing in the synopsis
- use of @strong{} texinfo markup

newlib/doc/makedocbook.py

@@ -293,9 +293,8 @@ def synopsis(c, t):
 
     s = ''
     for l in t.splitlines():
-	if re.match('\s*[#[]', l):
-	    # a #include, #define etc.
-	    # fpclassify contains some comments in [ ] brackets
+	if re.match('\s*(#|\[|struct)', l):
+	    # preprocessor # directives, structs, comments in square brackets
 	    funcsynopsisinfo = lxml.etree.SubElement(funcsynopsis, 'funcsynopsisinfo')
 	    funcsynopsisinfo.text = l.strip() + '\n'
 	else:
@@ -468,6 +467,8 @@ def line_markup_convert(p):
     # also convert some simple texinfo markup
     # convert @emph{foo} to <emphasis>foo</emphasis>
     s = re.sub('@emph{(.*?)}', '<emphasis>\\1</emphasis>', s)
+    # convert @strong{foo} to <emphasis role=strong>foo</emphasis>
+    s = re.sub('@strong{(.*?)}', '<emphasis role="strong">\\1</emphasis>', s)
     # convert @minus{} to U+2212 MINUS SIGN
     s = s.replace('@minus{}', '&#x2212;')
     # convert @dots{} to U+2026 HORIZONTAL ELLIPSIS