New package: zig-0.5.0.

Provided by @duncaen in #475

Restrict build to x86_64 (native) because the build failed on
i686 and cross builds. ENOTIME to investigate.

The ziglang is mature enough to be packaged, see pkgsrc and/or nix.

Close #475

srcpkgs/zig/template

@@ -0,0 +1,26 @@
+# Template file for 'zig'
+pkgname=zig
+version=0.5.0
+revision=1
+archs="x86_64*"
+build_style=cmake
+configure_args="-DZIG_STATIC=FALSE"
+hostmakedepends="clang llvm9"
+makedepends="libxml2-devel ncurses-devel zlib-devel"
+short_desc="Programming language designed for robustness, optimality, and clarity"
+maintainer="Duncaen <duncaen@voidlinux.org>"
+license="MIT"
+homepage="https://ziglang.org/"
+distfiles="https://ziglang.org/download/${version}/zig-${version}.tar.xz"
+checksum=55ae16960f152bcb9cf98b4f8570902d0e559a141abf927f0d3555b7cc838a31
+nopie=yes
+nocross=yes
+
+post_extract() {
+        # don't install build artefacts
+        vsed -i -e '/${ZIG_CPP_LIB_DIR}/d' CMakeLists.txt
+}
+
+post_install() {
+        vlicense LICENSE
+}