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             := msys2-libidn2
$(PKG)_NAME     := libidn2
$(PKG)_IGNORE   :=
$(PKG)_VERSION  := 2.3.0-1
$(PKG)_x86_64_CS := 5a18ac2fdd5800bd02ae2e727b0f628fe7483a6f
$(PKG)_i686_CS  := d33015d4d55c205b505d1b44cf941b1a708f6776
$(PKG)_CS       := $($(PKG)_$(MSYS2_ARCH)_CS)
$(PKG)_CHECKSUM := $($(PKG)_CS)
$(PKG)_SUBDIR   := 
$(PKG)_FILE     := $($(PKG)_NAME)-$($(PKG)_VERSION)-$(MSYS2_ARCH).pkg.tar.xz
$(PKG)_URL      := $(MSYS2_URL)/$($(PKG)_FILE)

#https://sourceforge.net/projects/msys2/files/REPOS/MSYS2/x86_64/bash-4.4.019-3-x86_64.pkg.tar.xz

$(PKG)_DEPS     := 

define $(PKG)_UPDATE
    $(MSYS2_PKG_UPDATE)
endef

define $(PKG)_BUILD
    $(MSYS2_PKG_BUILD)
endef