Added submodule contents into tree

externals/dynarmic/CMakeModules/FindUnicorn.cmake

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+# Exports:
+#
+# Variables:
+#  LIBUNICORN_FOUND
+#  LIBUNICORN_INCLUDE_DIR
+#  LIBUNICORN_LIBRARY
+#
+# Target:
+#  Unicorn::Unicorn
+#
+
+find_path(LIBUNICORN_INCLUDE_DIR
+          unicorn/unicorn.h
+          HINTS $ENV{UNICORNDIR}
+          PATH_SUFFIXES include)
+
+find_library(LIBUNICORN_LIBRARY
+             NAMES unicorn
+             HINTS $ENV{UNICORNDIR})
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Unicorn DEFAULT_MSG LIBUNICORN_LIBRARY LIBUNICORN_INCLUDE_DIR)
+
+if (UNICORN_FOUND)
+    set(THREADS_PREFER_PTHREAD_FLAG ON)
+    find_package(Threads REQUIRED)
+    unset(THREADS_PREFER_PTHREAD_FLAG)
+
+    add_library(Unicorn::Unicorn UNKNOWN IMPORTED)
+    set_target_properties(Unicorn::Unicorn PROPERTIES
+        IMPORTED_LOCATION ${LIBUNICORN_LIBRARY}
+        INTERFACE_INCLUDE_DIRECTORIES ${LIBUNICORN_INCLUDE_DIR}
+        INTERFACE_LINK_LIBRARIES Threads::Threads
+    )
+endif()
+
+mark_as_advanced(LIBUNICORN_INCLUDE_DIR LIBUNICORN_LIBRARY)