add libgourou

To use their own wording

> libgourou is a free implementation of Adobe's ADEPT protocol used to
> add DRM on ePub/PDF files. It overcomes the lack of Adobe support for
> Linux platforms.

It includes the shared library object as well as the CLI utilities for
managing Adobe ebook content.

packages/libgourou/build.sh

@@ -0,0 +1,21 @@
+TERMUX_PKG_HOMEPAGE=https://forge.soutade.fr/soutade/libgourou/
+TERMUX_PKG_DESCRIPTION="libgourou is a free implementation of Adobe's ADEPT protocol used to add DRM on ePub/PDF files."
+TERMUX_PKG_LICENSE="LGPL-3.0, BSD 3-Clause"
+TERMUX_PKG_MAINTAINER="@termux"
+TERMUX_PKG_VERSION="0.8.7"
+TERMUX_PKG_SRCURL="https://forge.soutade.fr/soutade/libgourou/archive/v${TERMUX_PKG_VERSION}.tar.gz"
+TERMUX_PKG_SHA256=e3df256e75a64aa18ca815080feccab4eabe49c177f39cec79d36f481660d6fd
+
+TERMUX_PKG_DEPENDS="libzip, libpugixml"
+TERMUX_PKG_BUILD_IN_SRC=true
+
+termux_step_make() {
+	export CXXFLAGS+=" -I$TERMUX_PREFIX/include -vv"
+	export LDFLAGS+=" -L$TERMUX_PREFIX/lib"
+
+	make
+}
+
+termux_step_make_install() {
+	make install
+}