Add build rule for build-octave (bug #49503). * src/build-octave.mk: Add new build rule for build-octave which can be used for cross-building binary packages that depend on Octave as a build tool. * dist-files.mk: Add new file to list. * index.html: Add new package to list. * src/of-communications.mk, src/of-image.mk, src/of-mapping.mk, src/of-optiminterp.mk, src/of-sparsersb.mk, src/of-statistics.mk, src/of-windows.mk: Add optional dependency on build-octave. * configure.ac: Add new configure switch "--disable-system-octave" that is needed to build the build-octave package. * Makefile.in: Add variable "USE_SYSTEM_OCTAVE". Exclude build-octave from the default build tools and build it only if a package explicitly depends on it. Display warning about missing native Octave version only if necessary.

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See index.html for further information.

Fix WinError.h capitalization. See http://svn.boost.org/trac/boost/ticket/7081

diff -ur a/boost/detail/win/basic_types.hpp b/boost/detail/win/basic_types.hpp
--- a/boost/detail/win/basic_types.hpp	2011-03-25 02:20:55.000000000 +0100
+++ b/boost/detail/win/basic_types.hpp	2013-11-13 18:59:00.225614699 +0100
@@ -14,7 +14,7 @@
 #if defined( BOOST_USE_WINDOWS_H )
 # include <windows.h>
 #elif defined( WIN32 ) || defined( _WIN32 ) || defined( __WIN32__ ) ||  defined(__CYGWIN__)
-# include <WinError.h>
+# include <winerror.h>
 // @FIXME Which condition must be tested
 # ifdef UNDER_CE
 #  ifndef WINAPI