libobs: Add util/sse2neon.h to CMakeLists

Add util/sse2neon.h to libobs_util_HEADERS in CMakelists.txt. The
previous patch #3180 for arm/rpi support was missing this in
libobs/CMakeLists.txt, and as a result plugins such as obs-websocket,
obs-ndi fail to compile on arm/rpi as the header is not copied with the
install.

libobs/CMakeLists.txt

@@ -362,6 +362,7 @@ set(libobs_util_SOURCES
 set(libobs_util_HEADERS
 	util/curl/curl-helper.h
 	util/sse-intrin.h
+	util/sse2neon.h
 	util/array-serializer.h
 	util/file-serializer.h
 	util/utf8.h