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 LICENSE.md for licensing information.

PKG             := qttranslations
$(PKG)_IGNORE   :=
$(PKG)_VERSION   = $(qtbase_VERSION)
$(PKG)_CHECKSUM := fb7b76c23df5ececfbce35a8f5ffba987807194a
$(PKG)_SUBDIR    = $(subst qtbase,qttranslations,$(qtbase_SUBDIR))
$(PKG)_FILE      = $(subst qtbase,qttranslations,$(qtbase_FILE))
$(PKG)_URL       = $(subst qtbase,qttranslations,$(qtbase_URL))
$(PKG)_DEPS     := qtbase qttools

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

define $(PKG)_BUILD
    cd '$(1)' && '$(MXE_QMAKE)'
    $(MAKE) -C '$(1)' -j '$(JOBS)'
    $(MAKE) -C '$(1)' -j 1 install
endef