SFML: add patch to fix incompatibility with musl NULL

srcpkgs/SFML/patches/119195ac20866fcecc93e33cda457b3fe54b1b0c.patch

@@ -0,0 +1,26 @@
+Upstream: yes
+Src: https://github.com/SFML/SFML/commit/119195ac20866fcecc93e33cda457b3fe54b1b0c.patch
+Reason: error: invalid cast from type 'std::nullptr_t' to type 'void*
+
+From 119195ac20866fcecc93e33cda457b3fe54b1b0c Mon Sep 17 00:00:00 2001
+From: Dmitry Marakasov <amdmi3@amdmi3.ru>
+Date: Tue, 16 Oct 2018 18:08:13 +0300
+Subject: [PATCH] Remove unneeded cast
+
+---
+ src/SFML/Window/Unix/WindowImplX11.cpp | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/SFML/Window/Unix/WindowImplX11.cpp b/src/SFML/Window/Unix/WindowImplX11.cpp
+index da69750525..5f538f46d6 100644
+--- a/src/SFML/Window/Unix/WindowImplX11.cpp
++++ b/src/SFML/Window/Unix/WindowImplX11.cpp
+@@ -1556,7 +1556,7 @@ void WindowImplX11::initialize()
+                                    m_window,
+                                    XNInputStyle,
+                                    XIMPreeditNothing | XIMStatusNothing,
+-                                   reinterpret_cast<void*>(NULL));
++                                   NULL);
+     }
+     else
+     {