Un-break build in the presence of print/texinfo

Details:
- If print/texinfo is installed, the build process detects and uses it to
  rebuild the info pages. This fails because of some syntax errors,
  previously only flagged as warnings.
- There is currently no configure switch to change this behaviour, hence
  the texi files are patched to pass the texinfo run.

MFH:		2017Q4 (ports-secteam build fix blanket)

games/gnugo/files/patch-doc_gnugo.texi

@@ -0,0 +1,11 @@
+--- doc/gnugo.texi.orig	2009-02-17 21:41:31 UTC
++++ doc/gnugo.texi
+@@ -26,7 +26,7 @@
+ 
+ @sp 1
+ @page
+-@title{GNU Go 3.8}
++@title GNU Go 3.8
+ @vskip 0pt plus 1filll
+ Copyright @copyright{} 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
+ 2008 and 2009 @uref{http://www.fsf.org,Free Software Foundation}, Inc.

games/gnugo/files/patch-doc_montecarlo.texi

@@ -0,0 +1,11 @@
+--- doc/montecarlo.texi.orig	2009-02-17 21:41:31 UTC
++++ doc/montecarlo.texi
+@@ -245,7 +245,7 @@ These can be combined arbitrarily but al
+ pattern to take effect. If contradictory properties are combined, the
+ pattern will never match.
+ 
+-@subsection Final Remarks
++@section Final Remarks
+ 
+ @itemize
+ @item  Move values are unsigned 32-bit integers. To avoid overflow in