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.

PKG             := build-yasm
$(PKG)_IGNORE   :=
$(PKG)_VERSION  := 1.3.0
$(PKG)_CHECKSUM := b7574e9f0826bedef975d64d3825f75fbaeef55e
$(PKG)_SUBDIR   := yasm-$($(PKG)_VERSION)
$(PKG)_FILE     := yasm-$($(PKG)_VERSION).tar.gz
$(PKG)_URL      := http://www.tortall.net/projects/yasm/releases/$($(PKG)_FILE)
$(PKG)_DEPS     := 

define $(PKG)_UPDATE
    echo $(yasm_VERSION)
endef

define $(PKG)_BUILD
    mkdir '$(1).build'
    cd '$(1).build' && '$(1)/configure' \
        --prefix='$(BUILD_TOOLS_PREFIX)' \
        --disable-nls \
        --disable-python
    $(MAKE) -C '$(1).build' -j '$(JOBS)' 
    $(MAKE) -C '$(1).build' -j 1 install DESTDIR='$(3)'
endef