dev-util/xmake: add 2.7.8, drop 2.7.7

Signed-off-by: Big Pineapple <zhangzheng.dylan@foxmail.com>

dev-util/xmake/xmake-2.7.8.ebuild

@@ -0,0 +1,50 @@
+# Copyright 2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit optfeature
+
+DESCRIPTION="A cross-platform build utility based on Lua"
+HOMEPAGE="https://xmake.io"
+
+if [[ ${PV} == *9999* ]]; then
+	inherit git-r3
+	EGIT_REPO_URI="https://github.com/xmake-io/${PN}.git"
+else
+	SRC_URI="https://github.com/xmake-io/${PN}/releases/download/v${PV}/${PN}-v${PV}.tar.gz"
+	KEYWORDS="~amd64 ~riscv ~x86"
+fi
+
+# tarball doesn't provide tests
+RESTRICT="test strip"
+LICENSE="Apache-2.0"
+SLOT="0"
+
+DEPEND="
+	sys-libs/ncurses:=
+	sys-libs/readline:=
+"
+BDEPEND="
+	virtual/pkgconfig
+"
+RDEPEND="
+	${DEPEND}
+	${BDEPEND}
+"
+
+DOCS=(
+	CHANGELOG.md CODE_OF_CONDUCT.md CONTRIBUTING.md
+	NOTICE.md README.md README_zh.md
+)
+
+src_configure(){
+	econf --prefix="${EPREFIX}"/usr \
+		--plat=linux
+		# --plat=linux is necessary, which enables correct directory:
+		# build/linux/ARCH other than build/ARCH/ARCH
+}
+
+pkg_postinst() {
+	optfeature "cached compilation for your xmake projects" dev-util/ccache
+}