emulators/citra: drop Clang < 3.8 workaround (FreeBSD < 11)

s20170516 is busted on 2017Q2, so don't pretend old Clang is still supported.
/head relies on USES=compiler:c++14-lang using Clang 4.0 after r439804.

emulators/citra/files/patch-src_video__core_shader_shader__jit__x64__compiler.cpp

@@ -1,17 +0,0 @@
-https://github.com/llvm-mirror/clang/commit/41885d36e85ead75a1d18ef7d2f43663f90ed67e
-
---- src/video_core/shader/shader_jit_x64_compiler.cpp.orig	2017-02-21 21:47:34 UTC
-+++ src/video_core/shader/shader_jit_x64_compiler.cpp
-@@ -6,7 +6,12 @@
- #include <cmath>
- #include <cstdint>
- #include <nihstro/shader_bytecode.h>
-+#if defined(__clang__) && (__clang_major__ == 3 && __clang_minor__ < 8)
-+// <smmintrin.h> requires -msse4.1 with Clang before 3.8
-+#define _MM_FROUND_FLOOR 0x01
-+#else
- #include <smmintrin.h>
-+#endif
- #include <xmmintrin.h>
- #include "common/assert.h"
- #include "common/logging/log.h"