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             := npp
$(PKG)_IGNORE   :=
$(PKG)_VERSION  := 7.8.9
$(PKG)_CHECKSUM := 26297d8c55833a6c43d16f3b0fa842ecd5153e20
$(PKG)_SUBDIR   := 
$(PKG)_FILE     := $(PKG).$($(PKG)_VERSION).bin.zip
$(PKG)_URL      := https://github.com/notepad-plus-plus/notepad-plus-plus/releases/download/v$($(PKG)_VERSION)/$($(PKG)_FILE)
$(PKG)_DEPS     :=

define $(PKG)_UPDATE
    $(WGET) -q -O- 'https://notepad-plus-plus.org/downloads/' | \
    $(GREP) 'Current' | \
    $(SED) -n 's|.*/v\([^/]*\).*|\1|p' | \
    tail -1
endef

define $(PKG)_BUILD
    mkdir -p '$(NOTEPAD_BASE_DIR)'
    cd '$(1)' && tar cf - . | ( cd '$(NOTEPAD_BASE_DIR)'; tar xpf - )
endef