doxygen2man: fix printing of lines starting with '.'

if a line starts with a '.' (eg the '...' in qbarray.h) then
nroff thinks it's looking for a macro called '..'.

The easiest solution is to add a dummy format at the start of the line
(just adding \ seems not to work).

doxygen2man/doxygen2man.c

@@ -222,6 +222,12 @@ static cstring_t get_codeline(xmlNode *this_tag)
 			buffer = cstring_append_chars(buffer, " ");
 		}
 		if (strcmp((char*)sub_tag->name, "text") == 0) {
+			// If the line starts with a dot then put a dummy format to
+			// stop nroff thinking it's a macro
+			char *tmp = (char*)sub_tag->content;
+			if (tmp[0] == '.') {
+				buffer = cstring_append_chars(buffer, (char*)"\\fN");
+			}
 			buffer = cstring_append_chars(buffer, (char*)sub_tag->content);
 		}
 		if (strcmp((char*)sub_tag->name, "ref") == 0) {