lavc: add missing files for arm

Across the many retouches those did not make the main commit.

libavcodec/arm/videodsp_arm.h

+/*
+ * Copyright (c) 2009 Mans Rullgard <mans@mansr.com>
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_ARM_VIDEODSP_ARM_H
+#define AVCODEC_ARM_VIDEODSP_ARM_H
+
+#include "libavcodec/avcodec.h"
+#include "libavcodec/videodsp.h"
+
+void ff_videodsp_init_armv5te(VideoDSPContext* ctx, int bpc);
+
+#endif /* AVCODEC_ARM_VIDEODSP_ARM_H */

libavcodec/arm/videodsp_init_armv5te.c

+/*
+ * Copyright (C) 2012 Ronald S. Bultje
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/arm/cpu.h"
+#include <libavcodec/videodsp.h>
+#include "videodsp_arm.h"
+
+void ff_prefetch_arm(uint8_t *mem, ptrdiff_t stride, int h);
+
+void ff_videodsp_init_armv5te(VideoDSPContext *ctx, int bpc)
+{
+    ctx->prefetch = ff_prefetch_arm;
+}