Vulkan packages (#8)

Reviewed-on: #8

glslang/all/CMakeLists.txt

@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.15)
+project(cmake_wrapper)
+
+# TODO:
+# - It should be find_package(SPIRV-Tools-opt REQUIRED CONFIG), but it can't be
+#   modeled yet in spirv-tools recipe.
+# - Upstream CMakeLists is not very neat, and doesn't always link
+#   Spirv-Tools-opt in all required targets. Keep in mind that it works thanks
+#   to global injection of include dirs/interface definitions from
+#   conan_basic_setup(). It won't work without patches when moving to
+#   CMakeToolchain + CMakeDeps.
+if(ENABLE_OPT)
+    find_package(SPIRV-Tools REQUIRED CONFIG)
+endif()
+
+add_subdirectory(src)