Updated build system to now download and include glm library

buildscripts/basalt.lua

@@ -5,6 +5,7 @@ local output_name = "basalt.lib"
 local include_dirs = "-I\"" .. table.concat({
 	"include",
 	"thirdparty/glfw/include",
+	"thirdparty/glm",
 	vulkan_sdk_dir .. "/Include",
 	vulkan_sdk_dir .. "/Include/vulkan",
 }, "\" -I\"") .. '\"'

buildscripts/configure.lua

@@ -1,7 +1,8 @@
 local function download_requirements()
 	-- Git module is not yet implemented, so delegate to the command-line
 	local argv = {
-		{"clone https://github.com/glfw/glfw.git thirdparty/glfw"}
+		{"clone https://github.com/glfw/glfw.git thirdparty/glfw"},
+		{"clone https://github.com/g-truc/glm.git thirdparty/glm"}
 	}
 	local ec, stdout, stderr = platform.exec_parallel("git", 1, argv)
 	for i,ec in pairs(ec) do

buildscripts/tests.lua

@@ -8,6 +8,7 @@ local output_name = args[1] .. '.exe'
 local include_dirs = "-I\"" .. table.concat({
 	"include",
 	"thirdparty/glfw/include",
+	"thirdparty/glm",
 	vulkan_sdk_dir .. "/Include",
 	vulkan_sdk_dir .. "/Include/vulkan",
 	"tests/" .. args[1] .. '/include'