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             := taglib
$(PKG)_IGNORE   :=
$(PKG)_VERSION  := 1.7.2
$(PKG)_CHECKSUM := e657384ccf3284db2daba32dccece74534286012
$(PKG)_SUBDIR   := $(PKG)-$($(PKG)_VERSION)
$(PKG)_FILE     := $(PKG)-$($(PKG)_VERSION).tar.gz
$(PKG)_URL      := https://taglib.github.io/releases/$($(PKG)_FILE)
$(PKG)_DEPS     := zlib

define $(PKG)_UPDATE
    $(WGET) -q -O- 'https://github.com/taglib/taglib/tags' | \
    $(SED) -n 's|.*releases/tag/v\([^"]*\).*|\1|p' | \
    $(SORT) -Vr | \
    head -1
endef

define $(PKG)_BUILD
    mkdir '$(1)/build'
    cd '$(1)/build' && cmake .. \
        -DCMAKE_TOOLCHAIN_FILE='$(CMAKE_TOOLCHAIN_FILE)' \
        -DENABLE_STATIC=ON
    $(MAKE) -C '$(1)/build' -j '$(JOBS)' install
endef