Openglada: Correct libx11 version (#276)

* Openglada: Correct libx11 version

* Index x11 on Arch

* Fix openglada 0.6 dependencies

* Set windowing system on Windows/macOS

* Fix gnat dependency to all platforms

Co-authored-by: Alejandro R. Mosteo <amosteo@unizar.es>

index/li/libx11/libx11-external.toml

@@ -7,4 +7,5 @@ maintainers-logins = ["mosteo"]
 [[external]]
 kind = "system"
 [external.origin."case(distribution)"]
+"arch" = ["libx11"]
 "debian|ubuntu" = ["libx11-dev"]

index/op/openglada/openglada-0.6.0.toml

@@ -10,16 +10,20 @@ maintainers-logins = ["flyx"]
 project-files = ["opengl.gpr", "opengl-glfw.gpr", "opengl-soil.gpr", "opengl-test.gpr"]
 
 [[depends-on]]
+gnat = "<8"
 [depends-on."case(os)".linux]
 libglfw3 = "^3"
-libx11 = "^2"
+libx11 = "^1"
 
 [gpr-externals]
 Auto_Exceptions = ["enabled", "disabled"]
 GLFW_Version = ["2", "3"]
 Mode = ["debug", "release"]
-[gpr-set-externals."case(os)".linux]
-Windowing_System = "x11"
+
+[gpr-set-externals."case(os)"]
+linux = { Windowing_System = "x11" }
+macos = { Windowing_System = "quartz" }
+windows = { Windowing_System = "windows" }
 
 [origin]
 url = "https://github.com/flyx/OpenGLAda/archive/v0.6.tar.gz"