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.

This file is part of MXE.
See index.html for further information.

Contains a fix for issue 35 on json-c (https://github.com/json-c/json-c/issues/35)

--- a/Makefile.am	2012-07-17 22:52:19.000000000 +0200
+++ b/Makefile.am	2012-07-17 22:54:09.000000000 +0200
@@ -17,6 +17,7 @@
 	json_config.h \
 	json_inttypes.h \
 	json_object.h \
+	json_object_iterator.h \
 	json_object_private.h \
 	json_tokener.h \
 	json_util.h \