use the packaged libsimde-dev

* debian/patches:
   - Use the SIMD Everywhere headers from libsimde-dev, instead of upstream's
     code copy
* debian/control
   - Build-dep on libsimde-dev
   - Add "Built-Using: ${simde:Built-Using}" to all the binary packages to
     document the version of libsimde-dev used, as required to keep that
     version in the Debian archive, which is needed to fulfill the GPL
* debian/copyright:
   - exclude libobs/util/simde/* as we will use the files from libsimde-dev
* debian/rules:
   - Include the recommended flags for SIMDe, especially important for
     non-X86 architectures

debian/patches/0009-use-libsimde-dev.patch

@@ -0,0 +1,13 @@
+Author: Michael R. Crusoe <michael.crusoe@gmail.com>
+Subject: Use the simd everywhere headers from libsimde-dev
+--- obs-studio.orig/libobs/util/sse-intrin.h
++++ obs-studio/libobs/util/sse-intrin.h
+@@ -19,7 +19,7 @@
+ 
+ #if NEEDS_SIMDE
+ 
+-#include "simde/sse2.h"
++#include <simde/x86/sse2.h>
+ 
+ #define __m128 simde__m128
+ #define _mm_setzero_ps simde_mm_setzero_ps

debian/patches/series

@@ -6,3 +6,4 @@
 0006-Add-SONAME.patch
 0007-Do-not-build-with-SSE2-enabled-on-i386.patch
 0008-rmtp-services-Remove-executable-bits-from-json-files.patch
+0009-use-libsimde-dev.patch