Set visibility of global symbols used in ARM specific assembly file to
internal.

Taken from Debian:
https://salsa.debian.org/multimedia-team/mpeg2dec/blob/master/debian/patches/60_arm-private-symbols.patch

--- mpeg2dec.orig/libmpeg2/motion_comp_arm_s.S
+++ mpeg2dec/libmpeg2/motion_comp_arm_s.S
@@ -23,7 +23,8 @@
 
 @ ----------------------------------------------------------------
 	.align
-	.global MC_put_o_16_arm
+	.global   MC_put_o_16_arm
+	.internal MC_put_o_16_arm
 MC_put_o_16_arm:
 	@@ void func(uint8_t * dest, const uint8_t * ref, int stride, int height)
 	pld [r1]
@@ -83,7 +84,8 @@ MC_put_o_16_arm_align_jt:
 
 @ ----------------------------------------------------------------
 	.align
-	.global MC_put_o_8_arm
+	.global   MC_put_o_8_arm
+	.internal MC_put_o_8_arm
 MC_put_o_8_arm:
 	@@ void func(uint8_t * dest, const uint8_t * ref, int stride, int height)
 	pld [r1]
@@ -152,7 +154,8 @@ MC_put_o_8_arm_align_jt:
 .endm
 
 	.align
-	.global MC_put_x_16_arm
+	.global   MC_put_x_16_arm
+	.internal MC_put_x_16_arm
 MC_put_x_16_arm:
 	@@ void func(uint8_t * dest, const uint8_t * ref, int stride, int height)
 	pld [r1]
@@ -244,7 +247,8 @@ MC_put_x_16_arm_align_jt:
 
 @ ----------------------------------------------------------------
 	.align
-	.global MC_put_x_8_arm
+	.global   MC_put_x_8_arm
+	.internal MC_put_x_8_arm
 MC_put_x_8_arm:
 	@@ void func(uint8_t * dest, const uint8_t * ref, int stride, int height)
 	pld [r1]
f.scm?id=2b56dc019a049b2f68ce078b243fc313fbaeacf3'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/unrtf.scm'>
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<div class='path'>path: <a href='/guix/log/?id=2b56dc019a049b2f68ce078b243fc313fbaeacf3'>root</a>/<a href='/guix/log/gnu?id=2b56dc019a049b2f68ce078b243fc313fbaeacf3'>gnu</a>/<a href='/guix/log/gnu/packages?id=2b56dc019a049b2f68ce078b243fc313fbaeacf3'>packages</a>/<a href='/guix/log/gnu/packages/unrtf.scm?id=2b56dc019a049b2f68ce078b243fc313fbaeacf3'>unrtf.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/unrtf.scm?id=2b56dc019a049b2f68ce078b243fc313fbaeacf3&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2015-07-18 13:05:01 +0300'>2015-07-18</span></td><td><a href='/guix/commit/gnu/packages/unrtf.scm?id=e881752c39d455a249731a4e81e64d86f50afc34'>gnu packages: Clean up synopses and descriptions.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/admin.scm, gnu/packages/algebra.scm, gnu/packages/audio.scm,
  gnu/packages/backup.scm, gnu/packages/base.scm, gnu/packages/bittorrent.scm,
  gnu/packages/code.scm, gnu/packages/compression.scm,
  gnu/packages/databases.scm, gnu/packages/enchant.scm,
  gnu/packages/firmware.scm, gnu/packages/fonts.scm,
  gnu/packages/freedesktop.scm, gnu/packages/games.scm, gnu/packages/gd.scm,
  gnu/packages/gl.scm, gnu/packages/gnome.scm, gnu/packages/gsasl.scm,
  gnu/packages/gstreamer.scm, gnu/packages/gtk.scm, gnu/packages/guile.scm,
  gnu/packages/haskell.scm, gnu/packages/language.scm,
  gnu/packages/lesstif.scm, gnu/packages/libreoffice.scm,
  gnu/packages/linux.scm, gnu/packages/llvm.scm, gnu/packages/maths.scm,
  gnu/packages/mcrypt.scm, gnu/packages/mit-krb5.scm, gnu/packages/mp3.scm,
  gnu/packages/ncdu.scm, gnu/packages/networking.scm, gnu/packages/ntp.scm,
  gnu/packages/ocaml.scm, gnu/packages/openbox.scm, gnu/packages/pdf.scm,
  gnu/packages/perl.scm, gnu/packages/pretty-print.scm,
  gnu/packages/pulseaudio.scm, gnu/packages/python.scm,
  gnu/packages/rdesktop.scm, gnu/packages/rdf.scm, gnu/packages/ruby.scm,
  gnu/packages/slang.scm, gnu/packages/slim.scm, gnu/packages/telephony.scm,
  gnu/packages/tls.scm, gnu/packages/tmux.scm, gnu/packages/tre.scm,
  gnu/packages/unrtf.scm, gnu/packages/version-control.scm,
  gnu/packages/vpn.scm, gnu/packages/web.scm, gnu/packages/wget.scm,
  gnu/packages/xdisorg.scm, gnu/packages/xfce.scm, gnu/packages/xiph.scm:
  Fix typos.  Trim long lines.  Add missing periods in the end of sentences.
  Use double spaces between sentences.  Remove trailing whitespaces.
</span></span></td><td>Alex Kost</td></tr>
<tr><td><span title='2015-07-03 22:54:51 +0200'>2015-07-03</span></td><td><a href='/guix/commit/gnu/packages/unrtf.scm?id=257b6c4375b37b11aa16810b24b956739e86ac0c'>gnu: unrtf: Fix download location.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/unrtf.scm (unrtf): Fix download location.
</span></span></td><td>Andreas Enge</td></tr>
<tr><td><span title='2015-06-19 11:08:20 +0200'>2015-06-19</span></td><td><a href='/guix/commit/gnu/packages/unrtf.scm?id=cbfb893493a286703e7c5092de07449b39a194a4'>gnu: unrtf: Update to 0.21.9.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/unrtf.scm (unrtf): Update to 0.21.9.
  [source]: Add 'modules' and 'snippet' fields.
  [arguments]: Remove.
</span></span></td><td>Ludovic Courtès</td></tr>